論文発表 - 茨城大学原子科学研究教育センター 物質構造物理研究室

Ami Shimoda, Kazuaki Iwasa, Keitaro Kuwahara, Hajime Sagayama, Hironori Nakao, Motoyuki Ishikado, Akiko Nakao, Seiko Ohira-Kawamura, Naoki Murai, Takashi Ohhara, and Yusuke Nambu
“Antiferromagnetic ordering and chiral crystal structure transformation in Nd₃Rh₄Sn₁₃”
Physical Review B 109, 134425 (2024) [10 pages], Editors' Suggestion (DOI: [Go to URL associated with DOI]).

Md Asif Afzal, Ryuji Higashinaka, Kazuaki Iwasa, Nazir Ahmed, Ryo Tsubota, Naoki Nakamura, Tatsuma D. Matsuda, and Yuji Aoki
"Superconductivity in chiral cubic Y₃Rh₄Ge₁₃"
Journal of Alloys and Compounds 978, 172914 (2024) [6 pages] (DOI: [Go to URL associated with DOI]).

岩佐和晃
「先端研究と人材育成で地域・社会に貢献する　茨城大学原子科学研究教育センター設立」
一般財団法人総合科学研究機構機関誌「CROSS T&T」77 (2024) 1-4（2024年7月5日発行）．

Kazuaki Iwasa, Kazuya Suyama, Seiko Ohira-Kawamura, Kenji Nakajima, Stéphane Raymond, Paul Steffens, Akira Yamada, Tatsuma D. Matsuda, Yuji Aoki, Ikuto Kawasaki, Shin-ichi Fujimori, Hiroshi Yamagami, and Makoto Yokoyama
"Weyl–Kondo semimetal behavior in the chiral structure phase of Ce₃Rh₄Sn₁₃"
Physical Review Materials 7, 014201 (2023) [11 pages] (DOI: [Go to URL associated with DOI]).

Ami Shimoda, Kazuaki Iwasa, Keitaro Kuwahara, Hajime Sagayama, Hironori Nakao, Motoyuki Ishikado, Takashi Ohhara, Akiko Nakao, Akinori Hoshikawa, and Toru Ishigaki
"Magnetic Ordering and Structural Phase Transitions of Nd₃T₄Sn₁₃ (T = Rh and Ir)"
JPS Conf. Proc. 38, 011091 (2023) [6 pages] (Proceedings of 29th International Conference on Low Temperature Physics (LT29), DOI: [Go to URL associated with DOI]).

岩佐和晃
PF研究会「開発研究多機能ビームラインの建設と利用」パラレルセッション報告
KEK Proceedings 2022-6, p. 160 (2023).

Kazuaki Iwasa
“Magnetic Excitations in Chiral-Structure Phase of Ce₃Ir₄Sn₁₃,”
J-PARC MLF Annual Report 2021, p. 44 (2023).

Y. Arai, Kenta Kuroda, T. Nomoto, Z. H. Tin, S. Sakuragi, C. Bareille, S. Akebi, K. Kurokawa, Y. Kinoshita, W.-L. Zhang, S. Shin, M. Tokunaga, H. Kitazawa, Y. Haga, H. S. Suzuki, S. Miyasaka, S. Tajima, K. Iwasa, R. Arita and Takeshi Kondo
"Multipole polaron in the devil’s staircase of CeSb,"
Nature Materials 21, 410–415 (2022) [7 pages] (DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa, Seiya Nakazato, Daisuke Hashimoto, Mami Shiozawa, Keitaro Kuwahara, Hajime Sagayama, Seiko Ohira-Kawamura, Naoki Murai, Devashibhai T. Adroja, and André M. Strydom
"Magnetic excitations in chiral-structure phase of Ce₃Ir₄Sn₁₃"
Journal of the Physical Society of Japan 90, 124701 (2021) [9 pages] (DOI: [Go to URL associated with DOI]).

Hironori Nakao and Kazuaki Iwasa
"Direct Observation of Modulation of p–f Hybridization in Unconventional Ordered Phase of PrRu₄P₁₂"
Journal of the Physical Society of Japan 89, 063703 (2020) [4 pages] (DOI: [Go to URL associated with DOI]).

Seiya Nakazato, Kazuaki Iwasa, Daisuke Hashimoto, Mami Shiozawa, Keitaro Kuwahara, Hironori Nakao, Hajime Sagayama, Motoyuki Ishikado, Takashi Ohhara, Akiko Nakao, Koji Munakata, and Ryoji Kiyanagi
"Successive phase transitions in R₃Ir₄Sn₁₃ (R: La and Ce) investigated using neutron and X-ray diffraction"
JPS Conf. Proc. 30, 011128 (2020) [6 pages] (Proceedings of the International Conference Strongly Correlated Electron Systems 2019,DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa
"Neutron Scattering Studies on 4f²-Electron Multipoles in Pr-based Systems,"
J. Phys. Soc. Jpn. 88 (2019) 081005 [14 pages] (SPECIAL TOPICS: New Frontiers in Physics with Spin, Orbital, and Atomic Correlations Using Neutron Scattering, Received September 30, 2018; accepted November 12, 2018; published online March 29, 2019, DOI: [Go to URL associated with DOI]).

K. Oyama, M. Sugishima, K. Tanabe, A. Mitsuda, H. Wada, K. Ohoyama, T. Matsukawa, Y. Yoshida, A. Hoshikawa, T. Ishigaki, and K. Iwasa
"Neutron Diffraction Studies on Valence Ordering Compound YbPd"
J. Phys. Soc. Jpn. 87 (2018) 114705 [6 pages] (Received July 5, 2018; accepted August 27, 2018; published online October 10, 2018, DOI: [Go to URL associated with DOI]).

Keisuke Tomiyasu, Naoko Ito, Ryuji Okazaki, Yuki Takahashi, Mitsugi Onodera, Kazuaki Iwasa, Tsutomu Nojima, Takuya Aoyama, Kenya Ohgushi, Yoshihisa Ishikawa, Takashi Kamiyama, Seiko Ohira-Kawamura, Maiko Kofu, Sumio Ishihara
"Quantum Paramagnet Near Spin-State Transition"
Adv. Quantum Technol. 1 (2018) 1800057 [7 pages] (Manuscript received: 26 June 2018, Manuscript revised: 21 September 2018, Version of Record online: 07 October 2018, DOI: [Go to URL associated with DOI]).

Kazuya Suyama, Kazuaki Iwasa, Yuka Otomo, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, Yoshinori Kitajima, Françoise Damay, Jean-Michel Mignot, Akira Yamada, Tatsuma D. Matsuda, and Yuji Aoki
"Chiral-crystal-structure transformations and magnetic states of R₃Rh₄Sn₁₃ (R = La and Ce)"
Phys. Rev. B 97 (2018) 235138 [9 pages] (Received 22 April 2018, Revised 10 June 2018, Published 22 June 2018, DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa, Fumitoshi Iga, Taketo Moyoshi, Akiko Nakao, and Takashi Ohhara
"Magnetic-Ordering Propagation Vectors of Terbium Hexaboride Revisited"
J. Phys. Soc. Jpn. 87, No.6 (2018) 064705 [5 pages] (Received February 24, 2018; accepted April 3, 2018; published online May 16, 2018, DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa, Takahiro Onimaru, Toshiro Takabatake, Ryuji Higashinaka, Yuji Aoki, Seiko Ohira-Kawamura, Kenji Nakajima
"Inelastic neutron scattering study on 4f-electron multipole system PrTr₂X₂₀ (Tr : transition metal, X : Al and Zn)"
Physica B: Physics of Condensed Matter 551 (2018) 37–40 (Proceedings of the International Conference on Neutron Scattering ICNS2017, Available online 4 November 2017, Published 15 December 2018, DOI: [Go to URL associated with DOI]).

Hironori Nakao, Chihiro Tabata, and Kazuaki Iwasa
"Resonant x-ray scattering study on electronic hybridization in unconventional ordered phase of PrRu₄P₁₂"
Journal of Physics: Conf. Series 969 (2018) 012118-1-5. (Proceedings of the 28th International Conference on Low Temperature Physics (LT28), Accepted Papers received: 13 February 2018, Published online: 19 April 2018, IOP Conf. Series, DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa, Sunil K. Sinha, William Kamitakahara, Jaime Fernandez-Baca, Keisuke Tajima & Kazuhisa Kakurai, Obituary "In memoriam: Nobuyoshi Wakabayashi (1938–2017)," Neutron News 29 (Issue 1) 32-34 (2018) (Published online: 27 Apr 2018. DOI: [Go to URL associated with DOI]).

Keisuke Tomiyasu, Mika Sato, Shun-Ichi Koyama, Tsutomu Nojima, Ryoichi Kajimoto, Sungdae Ji, and Kazuaki Iwasa
"Magnetic Properties of Electron-Doped LaCoO₃"
J. Phys. Soc. Jpn. 86 (2017) 094706 [6 pages] (Received May 30, 2017; Accepted July 11, 2017; Published August 23, 2017, DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa, Yuka Otomo, Kazuya Suyama, Keisuke Tomiyasu, Seiko Ohira-Kawamura, Kenji Nakajima, and Jean-Michel Mignot
"Crystal-electric-field excitations and spin dynamics in Ce₃Co₄Sn₁₃ semimetallic chiral-lattice phase"
Physical Review B 95 (2017) 195156 [9 pages] (Received 8 April 2017; revised 11 May 2017; published 26 May 2017, DOI: [Go to URL associated with DOI]).

Kazuaki Iwasa, Keisuke T. Matsumoto, Takahiro Onimaru, Toshiro Takabatake, Jean-Michel Mignot, and Arsen Gukasov
"Evidence for antiferromagnetic-type ordering of f-electron multipoles in PrIr₂Zn₂₀"
Physical Review B 95 (2017) 155106 [10 Pages] (Received 25 December 2016; revised manuscript received 15 March 2017; published 4 April 2017, DOI: [Go to URL associated with DOI]).

鬼丸孝博、岩佐和晃
「4f²配位系PrIr₂Zn₂₀における反強多極子秩序」
日本中性子科学会誌「波紋」27 (2017) 144-147（No. 4, 11月号）.

Kazuaki Iwasa, Ryuji Higashinaka, Yuji Aoki, Seiko Ohira-Kawamura, and Kenji Nakajima
"Broad Excitation Spectra between Crystalline-Electric-Field Levels Associated with Non-Kramers Doublet Ground State of f Electrons in PrNb₂Al₂₀"
J. Phys. Soc. Jpn. 85 (2016) 123704 [5 Pages] (Received July 30, 2016; accepted October 25, 2016; published online November 16, 2016, DOI: [Go to URL associated with DOI]).

Yuka Otomo, Kazuaki Iwasa, Kazuya Suyama, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, and Youichi Murakami
"Chiral crystal-structure transformation of R₃Co₄Sn₁₃ (R = La and Ce)"
Physical Review B 94 (2016) 075109-1-8 (Received 5 May 2016, Revised 24 July 2016, Published 5 August 2016, DOI: [Go to URL associated with DOI]).

Keisuke Tomiyasu, Syun-Ichi Koyama, Masanori Watahiki, Mika Sato, Kazuki Nishihara, Yuki Takahashi, Mitsugi Onodera, Kazuaki Iwasa, Tsutomu Nojima, Hiroyuki Nojiri, Jun Okamoto, Di-Jing Huang, Yuuichi Yamasaki, Hironori Nakao, Youichi Murakami
"Microscopic examinations of Co valences and spin states in electron-doped LaCoO₃"
J. Phys. Soc. Jpn. 85 (2016) 094702 [6 Pages] (Received April 24, 2016; Accepted June 20, 2016; Published August 2, 2016, DOI: [Go to URL associated with DOI]).

Y. W. Cheung, J. Z. Zhang, J. Y. Zhu, W. C. Yu, Y. J. Hu, D. G. Wang, Yuka Otomo, Kazuaki Iwasa, Koji Kaneko, Masaki Imai, Hibiki Kanagawa, Kazuyoshi Yoshimura, and Swee K. Goh
"Second-order structural transition in the superconductor La₃Co₄Sn₁₃"
Physical Review B 93 (2016) 241112(R)-1-5 (Received 3 May 2016; revised manuscript received 31 May 2016; published 21 June 2016, DOI: [Go to URL associated with DOI]).

K. Ohoyama, T. Yokoo, S. Itoh, M. Nanbu, K. Iwasa, M. Ohkawara, N. Kaneko, T. Ino, H. Hayashida, T. Oku, H. Kira, S. Tasaki, M. Takeda, H. Kimura, and T. J. Sato
"Polarisation Analysis Neutron Spectrometer, POLANO, at J-PARC - Concept and Magnetic Field Optimisation"
Journal of Physics: Conference Series 711 (2016) 012010 [8 pages] (Accepted papers received: 13 April 2016, Published online: 11 May 2016, doi:[Go to URL associated with DOI]).

岩佐和晃
連載講座 中性子散乱による原子・分子のダイナミクスの観測「VI-1 希土類金属系における電子自由度と磁気励起スペクトル」
RADIOISOTOPES, Vol. 65, No. 6, 287–295 (発行日：2016年6月15日, 日本アイソトープ協会[Japan Radioisotope Association]), doi: [Go to URL associated with DOI].

Hironori Nakao, Takaaki Sudayama, Masato Kubota, Jun Okamoto, Yuichi Yamasaki, Youichi Murakami, Hiroyuki Yamada, Akihito Sawa, and Kazuaki Iwasa
"Magnetic and electronic states in (LaMnO₃)₂(SrMnO₃)₂ superlattice exhibiting a large negative magnetoresistance"
Physical Review B 92 (2015) 245104-1-8 (Received 30 July 2015; revised manuscript received 31 October 2015; published 7 December 2015).

Tetsuya Yokoo, Kenji Ohoyama, Shinichi Itoh, Kazuaki Iwasa, Naokatsu Kaneko, Junichi Suzuki, Manabu Ohkawara, Kazuya Aizawa, Seiji Tasaki, Takashi Ino, Kaoru Taketani, Shigeru Ishimoto, Masayasu Takeda, Takayuki Oku, Hiroshi Kira, Kouichi Hayashi, Hiroyuki Kimura, and Taku J. Sato
"Polarized neutron spectrometer for inelastic experiments at J-PARC - Status of POLANO Project"
EPJ Web of Conferences 83 (2015) 03018-1-5 (QENS/WINS 2014, Autrans, France, May 11–16, 2014, Published online: 23 January 2015, DOI: [Go to URL associated with DOI]).

Shinichi Itoh, Tetsuya Yokoo, Takatsugu Masuda, Hideki Yoshizawa, Minoru Soda, Yoichi Ikeda, Soshi Ibuka, Daichi Kawana, Taku J. Sato, Yusuke Nambu, Keitaro Kuwahara, Shin-ichiro Yano, Jun Akimitsu, Yoshio Kaneko, Yoshinori Tokura, Masaki Fujita, Masashi Hase, Kazuaki Iwasa, Haruhiro Hiraka, Tatsuo Fukuda, Kazuhiko Ikeuchi, Koji Yoshida, Toshio Yamaguchi, Kanta Ono, Yasuo Endoh
"Science from the Initial Operation of HRC"
JPS Conf. Proc. 8, 034001 (2015) [6 pages] (Proceedings of the 2nd International Symposium on Science at J-PARC — Unlocking the Mysteries of Life, Matter and the Universe —, published on September 25, 2015, [Go to URL associated with DOI]).

Kazuaki Iwasa, Ari Yonemoto, Shigeru Takagi, Shinichi Itoh, Tetsuya Yokoo, Soshi Ibuka, Chihiro Sekine and Hitoshi Sugawara
"Nd-ion substitution effect on f-electron multipole order of PrRu₄P₁₂"
Physics Procedia 75 (2015) 179-186 (Selection and peer-review under responsibility of the Scientific Programme Committee of ICM 2015, Accepted on September 14 2015, Available online 29 December 2015, doi: [Go to URL associated with DOI]).

H. Nakao, H. Yamada, A. Sawa, K. Iwasa, J. Okamoto, T. Sudayama, Y. Yamasaki, Y. Murakami
"Neutron magnetic scattering study in manganite thin film system"
Solid State Communications 185 (2014) 18–20 (Received 16 November 2013, Received in revised form 14 January 2014, Accepted 20 January 2014).

Kotaro Saito, Claire Laulhé, Takahiro Sato, Lijie Hao, Jean-Michel Mignot, and Kazuaki Iwasa
"Emergence of reentrant metal-nonmetal transition in Pr_0.85Ce_0.15Ru₄P₁₂ and Pr(Ru_0.95Rh_0.05)₄P₁₂"
Phys. Rev. B 89 (2014) 075131-1-8 (Received 8 October 2013; published 24 February 2014).

Kazuaki Iwasa, Fumitoshi Iga, Ari Yonemoto, Yuka Otomo, Satoshi Tsutsui, and Alfred Q. R. Baron
"Universality of Anharmonic Motion of Heavy-Rare-Earth Atoms in Hexaborides"
J. Phys. Soc. Jpn. 83 (2014) 094604-1-6 (Received April 19, 2014; revised June 10, 2014; accepted July 3, 2014; published online August 12, 2014).

K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada
"Spin-Orbit Fluctuations in Frustrated Heavy-Fermion Metal LiV₂O₄"
Phys. Rev. Lett. 113 (2014) 236402-1-5 (Received 26 May 2014; published 4 December 2014)

T. Yokoo, K. Ohoyama, S. Itoh, J. Suzuki, M. Nanbu, N. Kaneko, K. Iwasa, T. J. Sato, H. Kimura and M. Ohkawara
"Construction of Polarized Inelastic Neutron Spectrometer in J-PARC"
Journal of Physics: Conference Series 502 (2014) 012046-1-5 (1st Conference on Light and Particle Beams in Materials Science 2013 (LPBMS2013), 29–31 August 2013, Tsukuba, Japan, Accepted papers received: 26 February 2014, Published online: 11 April 2014, doi: [Go to URL associated with DOI]).

K. Ohoyama, T. Yokoo, S. Itoh, T. Ino, M. Ohkawara, T. Oku, S. Tasaki, K. Iwasa, T. J. Sato, S. Ishimoto, K. Taketani, H. Kira, Y. Sakaguch, M. Nanbu, H. Hiraka, H. M. Shimizu, M. Takeda, M. Hino, K. Hayashi, U. Fliges, and P. Hautle
"Concepts of Neutron Polarisation Analysis Devices for a New Neutron Chopper Spectrometer, POLANO, in J-PARC"
Journal of Physics: Conference Series 502 (2014) 012051-1-4 (1st Conference on Light and Particle Beams in Materials Science 2013 (LPBMS2013), 29–31 August 2013, Tsukuba, Japan, Accepted papers received: 26 February 2014, Published online: 11 April 2014, 10.1088/1742-6596/502/1/012051).

Kazuaki Iwasa, Mitsuhide Amano, Hironori Nakao, Youichi Murakami
"Structural Modulation of the Cage Lattice System DyB₆"
JPS Conf. Proc. 3 (2014) 016026-1-6 (Proc. Int. Conf. Strongly Correlated Electron Systems (SCES2013), Received September 28, 2013, Published June 16, 2014, 10.7566/JPSCP.3.016025).

Lijie Hao, Kazuaki Iwasa, Hiroki Kobayashi, Kenji Nakajima, Seiko Ohira-Kawamura, Tatsuya Kikuchi, Dongfeng Chen, Yuntao Liu, Zhongxiao Liu, Shiliang Li, Ding Hu
"Effects of Co Substitution on the Magnetic Excitation in Heavy Fermion Compound PrFe₄P₁₂"
JPS Conf. Proc. 3 (2014) 011088-1-6 (Proc. Int. Conf. Strongly Correlated Electron Systems (SCES2013), Received September 30, 2013, Published June 16, 2014, 10.7566/JPSCP.3.011088).

Kazuaki Iwasa, Hiroki Kobayashi, Kotaro Saito, Keisuke Tomiyasu, Shuai Zhang, Yosikazu Isikawa, Jean-Michel Mignot, Gilles Andre, Daichi Kawana, Alexander I. Kolesnikov, Andrei T. Savici, Garrett E. Granroth
"Neutron scattering study on f-electron states in PrCu₄Au"
JPS Conf. Proc. 3 (2014) 011075-1-6 (Proc. Int. Conf. Strongly Correlated Electron Systems (SCES2013), Received September 28, 2013, Published June 16, 2014, 10.7566/JPSCP.3.011075).

Tetsuya Yokoo, Kenji Ohoyama, Shinichi Itoh, Kazuaki Iwasa, Naokatsu Kaneko, Junichi Suzuki, Manabu Ohkawara, Kazuya Aizawa, Seiji Tasaki, Takashi Ino, Kaoru Taketani, Shigeru Ishimoto, Masayasu Takeda, Takayuki Oku, Hiroshi Kira, Kouichi Hayashi, Hiroyuki Kimura, and Taku J. Sato
"Polarized neutron spectrometer for inelastic experiments at J-PARC - Status of POLANO Project"
EPJ Web of Conferences 83 (2015) 03018-1-5 (QENS/WINS 2014, Autrans, France, May 11–16, 2014, Published online: 23 January 2015).

岩佐和晃ほか
日本大百科全書（ニッポニカ）小学館百科事典 （"https://japanknowledge.com/contents/nipponica/index.html）
中性子回折・中性子散乱・熱中性子

Kazuaki Iwasa, Hiroki Kobayashi, Takahiro Onimaru, Keisuke T. Matsumoto, Naohiro Nagasawa, Toshiro Takabatake, Seiko Ohira-Kawamura, Tatsuya Kikuchi, Yasuhiro Inamura and Kenji Nakajima
"Well-Defined Crystal Field Splitting Schemes and Non-Kramers Doublet Ground States of f Electrons in PrT₂Zn₂₀ (T = Ir, Rh, and Ru)"
J. Phys. Soc. Jpn. 82 (2013) 043707 (5 pages) (No.4, Received January 14, 2013; accepted February 13, 2013, DOI: [Go to URL associated with DOI]) (JPSJ Top 20 Most Downloaded Articles - March 2013).

Lijie Hao, Kazuaki Iwasa, Rongdeng Liu, Xiaobai Ma, Zhongxiao Liu, Shiliang Li, Ding Hu,Yuntao Liu, Dongfeng Chen
"Growth of Single Crystal and Effects of Electron Doping in Filled Skutterudite Compound PrFe₄P₁₂"
Advanced Materials Research 807-809 (2013) 2793-2796 (the 3rd International Conference on Chemical Engineering and Advanced Materials (ICCEAM 2013), Announcement of publication on August 14, 2013, doi: [Go to URL associated with DOI]).

Tetsuya Yokoo, Kenji Ohoyama, Shinichi Itoh, Junichi Suzuki, Kazuaki Iwasa, Taku J Sato, Hiroshi Kira, Yoshifumi Sakaguchi, Takashi Ino, Takayuki Oku, Keisuke Tomiyasu, Masato Matsuura, Haruhiro Hiraka, Masaki Fujita, Hiroyuki Kimura, Toyoto Sato, Junichi Suzuki, Masayasu Takeda, Koji Kaneko, Masahiro Hino, Suguru Muto
"Newly Proposed Inelastic Neutron Spectrometer POLANO"
J. Phys. Soc. Jpn. 82 (2013) Supplement A SA035 (5 pages) (Proceedings of 10th International Conference on Quasielastic Neutron Scattering and 5th Workshop on Inelastic Neutron Spectrometers (QENS/WINS 2012), Received January 17, 2013, DOI: [Go to URL associated with DOI]).

K. Ohoyama, T. Yokoo, S. Itoh, J. Suzuki, K. Iwasa, T. J. Sato, H. Kira, Y. Sakaguchi, T. Ino, T. Oku, K. Tomiyasu, M. Matsuura, H. Hiraka, M. Fujita, H. Kimura, T. Sato, J. Suzuki, H. M. Shimizu, T. Arima, M. Takeda, K. Kaneko, M. Hino, S. Muto, H. Nojiri, C. H. Lee, J. G. Park, S. Choi
"Basic Concepts of Polarisation Analysis for Neutron Chopper Spectrometer POLANO at J-PARC"
J. Phys. Soc. Jpn. 82 (2013) Supplement A SA036 (6 pages) (Proceedings of 10th International Conference on Quasielastic Neutron Scattering and 5th Workshop on Inelastic Neutron Spectrometers (QENS/WINS 2012), Received December 24, 2012, DOI: [Go to URL associated with DOI]).

Daisuke Bizen, Hironori Nakao, Kazuaki Iwasa, Youichi Murakami, Toyotaka Osakabe, Jun Fujioka, Toshio Yasue, Shigeki Miyasaka, and Yoshinori Tokura
"Magnetic Phase Diagram of YVO₃ and TbVO₃ under High Pressure"
J. Phys. Soc. Jpn. 81 (2012) 024715-1-6 (Published: 2012/1/26).

Keisuke Tomiyasu, Kazuyuki Matsuhira, Kazuaki Iwasa, Masanori Watahiki, Seishi Takagi, Makoto Wakeshima, Yukio Hinatsu, Makoto Yokoyama, Kenji Ohoyama, Kazuyoshi Yamada
"Emergence of magnetic long-range order in frustrated pyrochlore Nd₂Ir₂O₇ with metal-insulator transition"
J. Phys. Soc. Jpn. 81 (2012) 034709-1-6 (Received October 30, 2011; Accepted December 28, 2011; Published February 20, 2012).

K. Tomiyasu, M. Matsuura, H. Kimura, K. Iwasa, K. Ohoyama, T. Yokoo, S. Itoh, E. Kudoh, T. Sato, and M. Fujita
"Modified Cross-Correlation for Efficient White-Beam Inelastic Neutron Scattering Spectroscopy"
Nucl. Instr. Meth. Phys. Res. A 677 (2012) 89-93 (11 June 2012).

Kenji Ohoyama, Kenji Tsutsumi, Takashi Ino, Haruhiro Hiraka, Yasuo Yamaguchi, Hiroshi Kira, Takayuki Oku, Yoshifumi Sakaguchi, Yasushi Arimoto, Wei Zhang, Hisamichi Kimura, Kazuaki Iwasa, Masayasu Takeda, Jun-ichi Suzuki, Kazuyoshi Yamada, Kazuhisa Kakurai
"Development of a Non-Adiabatic Two-Coil Spin Flipper for a Polarised Thermal Neutron Diffractometer with a ³He Spin Filter"
Nucl. Instr. Meth. Phys. Res. A 680 (2012) 75–81 (11 July 2012).

Kazuaki Iwasa, Lijie Hao, Masahumi Kohgi, Keitaro Kuwahara, Jean-Michel Mignot, Hitoshi Sugawara, Yuji Aoki, Tatsuma D. Matsuda, and Hideyuki Sato
"Magnetic Excitation in Totally Symmetric Staggered Ordered Phase of PrFe₄P₁₂"
J. Phys. Soc. Jpn. 81 (2012) 094711 (9 pages) (Received June 17, 2012; Accepted July 12, 2012; Published August 31, 2012).

Kazuaki Iwasa, Keitaro Kuwahara, Yoshihiro Utsumi, Kotaro Saito, Hiroki Kobayashi, Takahiro Sato, Mitsuhide Amano, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, Satoshi Tsutsui, and Alfred Q. R. Baron
"Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB₆"
J. Phys. Soc. Jpn. 81 (2012) 113601 (4 pages) (Received August 8, 2012; accepted September 19, 2012; published online October 15, 2012).

K. Iwasa, T. Orihara, K. Saito, K. Tomiyasu, Y. Murakami, H. Sugawara, K. Kuwahara, H. Kimura, R. Kiyanagi, Y. Ishikawa, Y. Noda, Y. Aoki, H. Sato and M. Kohgi
"Neutron scattering study on magnetic ordering in a partially rare-earth filled skutterudite Pr_xFe₄Sb₁₂"
Journal of Physics: Conference Series 391 (2012) 012025 (4 pages) (International Conference on Strongly Correlated Electron Systems 2011 (SCES2011), accepted on April 2, published online: 14 December 2012).

M. Watahiki, E. Matsuoka, K. Iwasa, Y. Matsumoto, S. Nakamura, T. Nojima, K. Ohoyama, K. Tanigaki, H. Aoki and H. Onodera
"Successive phase transitions induced by magnetic fields in a cubic system, NdPd₃S₄"
Journal of Physics: Conference Series 391 (2012) 012076 (4 pages) (International Conference on Strongly Correlated Electron Systems 2011 (SCES2011), accepted on March 26, published online: 14 December 2012).

岩佐和晃，平賀晴弘，大河原学，大山研司
「JRR-3に設置している東北大学中性子散乱装置の現状」
日本中性子科学会誌「波紋」22 (2012) 250-254（8月号）.

岩佐和晃
「f電子系における電子間相互作用と中性子散乱スペクトル」
日本中性子科学会誌「波紋」22 (2012) 314-317（11月号）.

K. Tomiyasu, H. Ueda, M. Matsuda, M. Yokoyama, K. Iwasa, and K. Yamada
"Molecular spin-liquid state in the spin-3/2 frustrated spinel HgCr₂O₄"
Phys. Rev. B 84 (2011) 035115 (published 21 July 2011).

K. Tomiyasu, M. K. Crawford, D. T. Adroja, P. Manuel, A. Tominaga, S. Hara, H. Sato, T. Watanabe, S. I. Ikeda, J. W. Lynn, K. Iwasa, and K. Yamada
"Molecular Spin-Orbit Excitations in the J_eff = 1/2 Frustrated Spinel GeCo₂O₄"
Phys. Rev. B 84, 054405 (2011) (published 2 August 2011).

R. Fukuta, S. Miyasaka, K. Hemmi, S. Tajima, D. Kawana, K. Ikeuchi, Y. Yamasaki, A. Nakao, H. Nakao, Y. Murakami, and K. Iwasa
"Effect of cation size variance on spin and orbital order in Eu_1-x(La_0.254Y_0.746)_xVO₃"
Phys. Rev. B 84 (2011) 140409(R) [4 pages] (Received 5 August 2011; revised 4 October 2011; published 24 October 2011).

Kazuaki Iwasa, Ryosuke Igarashi, Kotaro Saito, Claire Laulhé, Toshihiko Orihara, Satoru Kunii, Keitaro Kuwahara, Hironori Nakao, Youichi Murakami, Fumitoshi Iga, Masafumi Sera, Satoshi Tsutsui, Hiroshi Uchiyama, and Alfred Q. R. Baron
"Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB₆"
Phys. Rev. B 84 (2011) 214308-1-6 (Received 21 October 2011; revised manuscript received 3 December 2011; published 28 December 2011).

K. Iwasa, R. Igarashi, K. Saito, C. Laulhé, T. Orihara, S. Kunii, K. Kuwahara, H. Nakao, Y. Murakami, F. Iga, M. Sera, S. Tsutsui, H. Uchiyama, and A. Q. R. Baron
"Softening of the Longitudinal Phonon Mode along the [100] Direction in GdB₆"
Chinese Journal of Physics 49, No. 1 February, (2011) 231-238.

Kotaro Saito, Kazuaki Iwasa, Lijie Hao, Hironori Nakao and Youichi Murakami
"Magnetic Field and Temperature Dependence of X-ray Superlattice Intensity in Multipole Ordered Phase of Pr(Ru_1-xRh_x)₄P₁₂ (x = 0, 0.03)"
J. Phys. Soc. Jpn. 80 (2011) SA026-1-3 (Proc. Int. Conf. Heavy Electrons (ICHE2010)).

Kazuaki Iwasa, Yoshiaki Mori, Shohei Itobe, Ryosuke Igarashi, Youichi Murakami, Hitoshi Sugawara, Masahumi Kohgi, Hideyuki Sato
"Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages"
J. Phys. Soc. Jpn. 80 (2011) SA032-1-3 (Proc. Int. Conf. Heavy Electrons (ICHE2010)).

M. Watahiki, K. Tomiyasu, K. Matsuhira, K. Iwasa, M. Yokoyama, S. Takagi, M. Wakeshima and Y. Hinatsu
Crystalline electric field study in the pyrochlore Nd₂Ir₂O₇ with metal-insulator transition"
Journal of Physics: Conference Series 320 (2011) 012080-1-5 (International Conference on Frustration in Condensed Matter (ICFCM), Published online: 28 September 2011).

Keisuke Tomiyasu, Ayaka Tominaga, Shigeo Hara, Hirohiko Sato, Tadataka Watanabe, Shin-Ichi Ikeda, Haruhiro Hiraka, Kazuaki Iwasa and Kazuyoshi Yamada
"Spin-orbit coupling inactivity of Co²⁺ ion in geometrically frustrated magnet GeCo₂O₄"
Journal of Physics: Conference Series 320 (2011) 012038-1-5 (International Conference on Frustration in Condensed Matter (ICFCM), Published online: 28 September 2011).

T. Yokobori, K. Tomiyasu, Y. Kousaka, H. Matsui, H. Hiraka, K. Iwasa, K. Yamada and J. Akimitsu
"Neutron scattering study of spiral-type spin correlations in the frustrated spinel Mn_0.07Mg_0.93Cr₂O₄"
Journal of Physics: Conference Series 320 (2011) 012039-1-5 (International Conference on Frustration in Condensed Matter (ICFCM), Published online: 28 September 2011).

Kazuaki Iwasa, Kotaro Saito, and Lijie Hao
"New Aspects of Electronic Ordered States due to f² Configuration of Pr-Based Systems"
J. Phys. Soc. Jpn. 80 (2011) SB019 (Proceedings of the International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (NASCES11), Published online December 20, 2011).

平賀 晴弘，岩佐和晃，大山研司
「中性子科学における学生教育」
日本中性子科学会誌「波紋」21 (2011) 37-41（2月号）.

K. Iwasa: JPSJ Online—News and Comments [May 10, 2011].
News and Comments on "f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂," J. Phys. Soc. Jpn. 80 (2011) 054704.
"Exploring a Quantum State Hierarchy for f Electrons: Evolution into Electron-Nuclear Hyperfine-Coupled Multiplets via Multipole Ordering"

Toyotaka Osakabe, Keitaro Kuwahara, Daichi Kawana, Kazuaki Iwasa, Daisuke Kikuchi, Yuji Aoki, Masahumi Kohgi, and Hideyuki Sato
"Pressure-Induced Antiferromagnetic Order in Filled Skutterudite PrFe₄P₁₂ Studied by Single-Crystal High-Pressure Neutron Diffraction"
J. Phys. Soc. Jpn. 79 (2010) 034711.

Eiichi Matsuoka, Daichi Usui, Yuta Sasaki, Masanori Watahiki, Kazuaki Iwasa, Hiroshi Shida, Kenji Ohoyama, and Hideya Onodera
"Antiferromagnetic Alignment of Magnetic Dipolar Moments Observed by Neutron Powder Diffraction in Rare-Earth Palladium Bronze PrPd₃S₄"
J. Phys. Soc. Jpn. 79 (2010) 064708.

K. Iwasa, K. Saito, Y. Murakami and H. Sugawara
"Temperature evolution of crystal field splitting in Pr-filled skutterudite"
J. Phys.: Conf. Ser. 200 (2010) 012071 (4pp) (Published online: 15 February 2010).

K. Kuwahara, K. Tanaka, T. Saito, S. Tatsuoka, K. Iwasa, M. Watanabe, Y. Aoki, H. Sato, M. Kohgi, K. Iwasa, H. Sugawara, C. Stock and D. T. Adroja
"Crystal field excitations in PrFe₄Sb₁₂ synthesized under high pressure"
J. Phys.: Conf. Ser. 200 (2010) 012101 (4pp) (Published online: 15 February 2010).

C. Laulhe, K. Saito, K. Iwasa, H. Nakao and Y. Murakami
"Structural modulation and multipolar ordering in the metal-nonmetal compounds Pr(Ru_1-xRh_x)₄P₁₂"
J. Phys.: Conf. Ser. 200 (2010) 012102 (4pp) (Published online: 15 February 2010).

Kotaro Saito, Claire Laulhe, Kazuaki Iwasa and Youichi Murakami
"Rh-substitution effect on 4f-electron states in multipole ordered phase of PrRu₄P₁₂"
J. Phys.: Conf. Ser. 200 (2010) 012170 (4pp) (Published online: 15 February 2010).

S. Raymond, K. Kuwahara, K. Kaneko, K. Iwasa, M. Kohgi, A. Hiess, J. Flouquet, N. Metoki, H. Sugawara, Y. Aoki and H. Sato
“Excitation spectrum of PrOs₄Sb₁₂ under a magnetic field"
J. Phys.: Condens. Matter 21 (2009) 215702 (5pp) Published 24 April 2009.

Kazuaki Iwasa, Kotaro Saito, Youichi Murakami, and Hitoshi Sugawara
“Electronic hybridization effect on 4f electron crystal field states of PrOs₄P₁₂”
Phys. Rev. B 79 (2009) 235113-1-6 (Published Mon Jun 8, 2009).

N. Kida, D. Okuyama, S. Ishiwata, Y. Taguchi, R. Shimano, K. Iwasa, T. Arima, and Y. Tokura
“Electric-dipole-active magnetic resonance in the conical-spin magnet Ba2Mg2Fe12O22”
Phys. Rev. B 80 (2009) 220406(R) (Published 10 December 2009).

K. Kuwahara, K. Iwasa, M. Kohgi, N. Aso, M. Sera, F. Iga, M. Matsuura, K. Hirota
"Magnetic octupole ordering in Ce0.7La0.3B6: A polarized neutron diffraction study"
Physica B 404 (2009) 2527-2528 (1 September 2009).

"Spin-Singlet Ground State in the Two-Dimensional Frustrated Triangular Lattice: YbAl3C3"
Y. Kato, M. Kosaka, H. Nowatari, Y. Saiga, A. Yamada, T. Kobiyama, S. Katano, K. Ohoyama, H. S. Suzuki, N. Aso and K. Iwasa
J. Phys. Soc. Jpn. 77, 053701-, (2008).

"Novel Features Realized in the Filled Skutterudite Structure"
H. Sato, D. Kikuchi, K. Tanaka, M. Ueda, H. Aoki, T. Ikeno, S. Tatsuoka, K. Kuwahara, Y. Aoki, M. Kohgi, H. Sugawara, K. Iwasa and H. Harima
J. Phys. Soc. Jpn. 77, Supplement A- 1-6., (2008).

"Magnetic excitations in the heavy electron state of the filled skutterudite PrxLa1-xFe4P12 (x=1.00 and 0.85)"
K. Iwasa, L. Hao, T. Hasegawa, K. Horiuchi, Y. Murakami, J. Otsuki, Y. Kuramoto, M. Kohgi, K. Kuwahara, H. Sugawara, Y. Aoki, H. Sato
J. Phys. Soc. Jpn. 77, 063706-1-4, (2008).

"Magnetic Correlation in the Ordered Phase of CeOs4Sb12"
K. Iwasa, S. Itobe, C. Yang, Y. Murakami, M. Kohgi, K. Kuwahara, H. Sugawara, H. Sato,N. Aso, T. Tayama and T. Sakakibara
J. Phys. Soc. Jpn. 77, Supplement A-318-320, (2008).

"Inelastic Neutron Scattering Study of the Heavy Fermion Superconductor PrOs4Sb12"
S. Raymond, K. Kuwahara, K. Kaneko, K. Iwasa, M. Kohgi, A. Hiess, M.-A. M_asson, J. Flouquet, N. Metoki, H. Sugawara, Y. Aoki, and H. Sato
J. Phys. Soc. Jpn. 77, Supplement A-25-30, (2008).

"Inelastic neutron scattering from PrFe4P12 at low temperatures and under high magnetic fields"
J.-G. Park, D. T. Adroja, K. A. McEwen, M. Kohgi and K. Iwasa
Phys. Rev. B 77, 085102-1-6, (2008).

"Field Induced Magnetic Moment Distribution in the Ordered Phase of PrFe4P12"
K. Iwasa, L. Hao, Y. Murakami, M. Kohgi, K. Kuwahara, H. Sugawara, T. D. Matsuda, Y. Aoki, H. Sato, J.M. Mignot and A. Gukasov
J. Phys. Soc. Jpn. 77, Supplement A-67-71, (2008).

"Competition of magnetic and quadrupolar order parameters in HoB4"
D. Okuyama, T. Matsumura, T. Mouri, N. Ishikawa, K. Ohoyama, H.Hiraka, H. Nakao, K. Iwasa, Y. Murakami
J. Phys. Soc. Jpn. 77, 044709-1-14, (2008).

"Crystal field excitations in the filled skutterudite NdOs4Sb12"
K .Kuwahara, M .Takagi, K .Iwasa, S .Itobe, D .Kikuchi, Y .Aoki, M .Kohgi, H .Sato and H .Sugawara
Physica B: Condensed Matter 403, 903-905, (2008).

「Pr充填スクッテルダイトにおける4f電子多極子秩序と励起」
岩佐和晃、桑原慶太郎、神木正史
固体物理（4月号、通巻506号） 43, 207-220, (2008).

"The Unconventional Superconductivity of Skutterudite PrOs4Sb12: Time-Reversal Symmetry Breaking and Adjacent Field-Induced Quadrupole Ordering"
Y. Aoki, T. Tayama, T. Sakakibara, K. Kuwahara, K. Iwasa, M. Kohgi, W. Higemoto, D. E. MacLaughlin, H. Sugawara, H. Sato
J. Phys. Soc. Jpn. 76, 051006-1-13, (2007).

"Detection of Neutron Scattering from Phase IV of Ce0.7La0.3B6: A Confirmation of the Octupole Order"
K. Kuwahara, K. Iwasa, M. Kohgi, N. Aso, M. Sera and F. Iga
J. Phys. Soc. Jpn. 76, 093702-1-4, (2007).

"Softening phonon and relaxation mode in the filled skutterudite PrT4Sb12 (T = Ru and Os)"
K. Iwasa, Y. Mori, L. Hao, Y. Murakami, M. Kohgi, H. Sugawara and H. Sato
Journal of Physics: Conference Series 92, 012122-1-4, (2007).

"Resonant X-ray scattering PrRu4P12"
K. Ishii, S. Tsutusi, L. Hao, T. Hasegawa, K. Iwasa, M. Tsubota, T. Inami, Y. Murakami, S. R. Saha, H. Sugawara and H. Sato
J. Magn. Magn. Mater. 310, e178-e180, (2007).

"Orbital ordering and the dilute effect in copper fluoride"
N. Tatami, Y. and o, S. Niioka, H. Kira, M. Onodera, H. Nakao, K. Iwasa, Y. Murakami, T. Kakiuchi, Y. Wakabayashi, H. Sawa and S. Itoh
J. Magn. Magn. Mater. 310, 787-789, (2007).

"Novel electronic states realized in the filled skutterudites containing rare earth elements with more than one 4f-electrons"
H. Sato, D. Kikuchi, K. Tanaka, H. Aoki, K. Kuwahara, Y. Aoki, M. Kohgi, H. Sugawara and K. Iwasa
J. Magn. Magn. Mater. 310, 188-194, (2007).

"Magnetic phase transition in HoB4 studied by neutron diffraction"
D. Okuyama, T. Matsumura, K. Iwasa and Y. Murakami
J. Magn. Magn. Mater. 310, e152-e154, (2007).

"Inelastic neutron scattering measurements in a quadrupolar ordering compound YbSb"
A. Oyamada, K. Kuwahara, K. Ohoyama, K. Iwasa, M. Kohgi and S. Maegawa
J. Magn. Magn. Mater. 310, 766-767, (2007).

"Fractal dimension in percolating Heisenberg antiferromagnets"
S. Itoh, R. Kajimoto, M. A. Adams, M. J. Bull, K. Iwasa, N. Aso, H. Yoshizawa and T. Takeuchi
J. Magn. Magn. Mater. 310, 1549-1551, (2007).

"Antiferromagnetic ordering in the filled skutterudite semiconductor CeOs4Sb12"
K. Iwasa, C. Yang, M. Kohgi, H. Sugawara, H. Sato and N. Aso
J. Magn. Magn. Mater. 310, 268-270, (2007).

“Valence state in R4As3 (R = Yb and Eu) studied by resonant and non-resonant X-ray scattering”
H. Nakao, K. Kiyoto, K. Nakatsuka, D. Bizen, T. Murata, S. Kodama, T. Matsumura, K. Iwasa, Y. Murakami and A. Ochiai
J. Phy. Chem. Solids 68 (2007) 2064-2067

"Structural Transformation on the Pressure-Induced Metal_Insulator Transition in PrFe4P12"
D. Kawana, K. Kuwahara, M. Sato, M. Takagi, Y. Aoki, M. Kohgi, H. Sato, H. Sagayama, T. Osakabe, K. Iwasa and H. Sugawara
Journal of the Physical Society of Japan 75 No.11, 113602-1-4, (2006).

"p-f hybridization effect on the metal-nonmetal phase transition in PrRu4P12"
L. Hao, K. Iwasa, T. Hasegawa, T. Takagi, K. Horiuchi, Y. Mori, Y. Murakami, K. Kuwahara, M. Kohgi, H. Sugawara, S. R.Saha, Y. Aoki and H. Sato
Physica B Condensed Matter 378-380, 204-205, (2006).

"Magnetic form factor of URu2Si2"
K. Kuwahara, M. Kohgi, K. Iwasa, M. Nishi, K. Nakajima, M. Yokoyama and H. Amitsuka
Physica B　Condensed Matter 378-380, 581-582, (2006).

"Large softening of acoustic phonons in PrOs4Sb12"
K. Iwasa, M. Kohgi, H. Sugawara and H. Sato
Physica B　 Condensed Matter 378-380, 194-196, (2006).

"High-pressure X-ray diffraction study of PrFe4P12 "
D. Kawana, H. Sagayama, M. Sato, K. Kuwahara, Y. Aoki, M. Kohgi, H. Sato, K. Iwasa and H. Sugawara
Physica B Condensed Matter 378-380, 217-219, (2006).

"Charge Ordered State in Yb4As3 Studied by a Resonant X-ray Scattering Technique"
H. Nakao, K. Kiyoto, S. Kodama, D. Bizen, T. Matsumura, K. Iwasa, Y. Murakami and A. Ochiai
AIP Conference Proceedings 850, 1175-1176, (2006).

"Role of p-f Hybridization in the Metal-Nonmetal Transition of PrRu4P12"
K. Iwasa, L. Hao, T. Hasegawa, T. Takagi, K. Horiuchi, Y. Mori, Y. Murakami, K. Kuwahara, M. Kohgi, H. Sugawara, S. R. Saha, Y. Aoki and H. Sato
J. Phys. Soc. Jpn. 74, 1930-1933, (2005).

"Powder neutron diffraction studies of structure and magnetic Ce ordering in the strongly correlated electron compound Ce0.75La0.2511B6"
P. Fischer, K. Iwasa, K. Kuwahara, M. Kohgi, T. Hansen, and S. Kunii
Phys. Rev. B 72, 014414-1-6, (2005).

"Inelastic Neutron Scattering from CeOs4Sb12"
C. Yang, M. Kohgi, K. Iwasa, H. Sugawara and H. Sato
J. Phys. Soc. Jpn. 74, 2862-2863, (2005).

"Evolution of 4fElectron States in the Metal-Insulator Transition of PrRu4P12"
K. Iwasa, L. Hao, K. Kuwahara, M. Kohgi, ShantaRanjanSaha, H. Sugawara, Y. Aoki, H. Sato, T. Tayama and T. Sakakibara
Phys. Rev. B 72, 024414-1-5, (2005).

"Electrical and Magnetic Properties of a Single Crystal UCu2Si2"
T. D. Matsuda, Y. Haga, S. Ikeda, A. Galatanu, E. Yamamoto, H. Shishido, M. Yamada, J. Yamaura, M. Hedo, Y. Uwatoko, T. Matsumoto, T. Tada, S. Noguchi, T. Sugimoto, K. Kuwahara and K. Iwasa
J. Phys. Soc. Jpn. 74, 1552-1556, (2005).

"Direct Observation of Quadrupolar Excitons in the Heavy-Fermion Superconductor PrOs4Sb12"
K. Kuwahara, K. Iwasa, M. Kohgi, K. Kaneko, N. Metoki, S. Raymond, M. -A. Measson, J. Flouquet, H. Sugawara, Y. Aoki, and H. Sato
Phys. Rev. Lett. 95, 107003-1-4, (2005).

"Spin dynamics of quadrupole-ordered PrFe4P12"
J. -G. Park, D. T. Adroja, K. A. McEwen, M. Kohgi and K. Iwasa
Physica B 359-361, 868-870, (2005).

"Spin density wave and charge density wave in the Kondo-lattice compound Ce(Ru1-xRhx)2Si2"
Y. Tabata, T. Taniguchi, S. Kawarazaki, Y. Narumi, S. Kimura, Y. Tanaka, K. Katsumata, T. Ishikawa, U. Staub, M. Kohgi and K. Iwasa
Physica B 359-361, 260-262, (2005).

"Resonant and non-resonant x-ray scattering from GdB6"
K. Kuwahara, R. Yamamoto, M. Kohgi, H. Nakao, K. Ishii, K. Iwasa, Y. Murakami, S. Kunii, H. Sagayama, Y. Wakabayashi and H. Sawa
Physica B 359-361, 965-967, (2005).

"Quantum spin excitations in Yb4As3 under magnetic field"
M. Kohgi, K. Iwasa, J.-M. Mignot, A. Hiess, A. Ochiai and H. Aoki
Physica B 359-361, 1436-1438, (2005).

"Neutron Scattering Studies of Order Parameters and Excitations in Antiferro-Quadrupolar Phase of PrFe4P12"
L. Hao, K. Iwasa, K. Kuwahara, M. Kohgi, H. Sugawara, Y. Aoki, H. Sato, T. D. Matsuda, J.-M. Mignot and A. Gukasov
Physica B 359-361, 871-873, (2005).

"Magnetic excitations in the heavy fermion superconductor PrOs4Sb12"
S. Raymond, J. Flouquet, K. Kuwahara, K. Iwasa, M. Koghi, K. Kaneko, N. Metoki, H. Sugawara, Y. Aoki and H. Sato
Physica B 359-361, 898-890, (2005).

"Drastic Evolution of 4f-electron States in the Metal-Insulator Transition of PrRu4P12"
K. Iwasa, L. Hao, K. Kuwahara, M. Kohgi, S. R. Saha, H. Sugawara, Y. Aoki and H. Sato
Physica B 359-361, 833-835, (2005).

"Anomalous Thermal Expansion in the Metallic Phase of SmS under High Pressure"
K. Iwasa, T. Tokuyama, M. Kohgi, N. K. Sato and N. Mori
Physica B 359-361, 148-150, (2005).

"重い電子状態を示すPr充填スクッテルダイトにおける四極子秩序"
"岩佐和晃, 神木正史"
中性子科学会誌「波紋」 13, 120-123, (2005).

"Magnetic excitations in heavy-fermion superconductor PrOs4Sb12"
K. Kuwahara, K. Iwasa, M. Kohgi, K. Kaneko, S. Araki, N. Metoki, H. Sugawara, Y. Aoki and H. Sato
J. Phys. Soc. Jpn. 73, 1438-1441, (2004).

"Exotic properties of CeSb studied by x-ray diffraction"
A. Hannan, K. Iwasa, M. Kohgi, T. Osakabe, H. Kitazawa and T. Suzuki
J. Phys. Soc. Jpn. 73, 1881-1887, (2004).

"Studies of unusual magnetic and electronic properties of the low-carrier system CeP by synchrotron X-rays"
M. Kohgi, K. Iwasa, K. Kuwahara, A. Hannan, D. Kawana, Y. Noda, T. Shobu, K. Katsumata, Y. Narumi and Y. Tabata
Physica B 345, 55-58, (2004).

"Neutron scattering study on the field-induced antiferro-quadrupolar ordering in the heavy fermion superconductor PrOs4Sb12"
N. Metoki, K. Kaneko, S. Araki, M. Kohgi, K. Iwasa, K. Kuwahara, N. Bernhoeft, J.-M. Mignot, A. Gukasov, H. Sato, Y. Aoki and H. Sugawara
J. Magn. Magn. Mater. 272-276, e91-e92, (2004).

"Crystal-lattice modulation of the metal-insulator transition system PrRu4P12 studied by X-ray diffraction"
L. Hao, K. Iwasa, K. Kuwahara, M. Kohgi, S. R. Saha, H. Sugawara, Y. Aoki, H. Sato, C. Sekine, C. H. Lee and H. Harima
J. Magn. Magn. Mater. 272-276, e271-e272, (2004).

"Anomalous phonon excitations associated with strong p-f mixing effect of CeSb and CeBi"
K. Iwasa, M. Kohgi, M. Braden, J.-M. Mignot, H. Kitazawa and T. Suzuki
J. Magn. Magn. Mater. 272-276, e65-e66, (2004).

"Evidence for magnetic-field-induced quadrupolar ordering in the heavy-fermion superconductor PrOs4Sb12"
M. Kohgi, K. Iwasa, M. Nakajima, N. Metoki, S. Araki, N. Bernhoeft, J.-M. Mignot, A. Gukasov, H. Sato, Y. Aoki and H. Sugawara
J. Phys. Soc. Jpn. 72, 1002-1005, (2003).

"Successive structural phase transitions of the semiconductive CeRhAs"
M. Nakajima, K. Iwasa, M. Kohgi, T. Sasakawa and T. Takabatake
Acta Physica Polonica B 34, 1109-1112, (2003).

"Resonant X-ray scattering study on the filled skutterudite PrFe4P12"
K. Ishii, T. Inami, Y. Murakami, L. Hao, K. Iwasa, M. Kohgi, Y. Aoki, H. Sugawara, H. Sato, S. Imada, H. Nakao, H. Sawa and Y. Wakabayashi
Physica B 329-333, 467-468, (2003).

"Neutron-diffraction study of the unusual ordered phases of Ce0.75La0.25B6"
K. Iwasa, K. Kuwahara, M. Kohgi, P. Fischer, A. Donni, L. Keller, T. C. Hansen, S. Kunii, N. Metoki, Y. Koike and K. Ohoyama
Physica B 329-333, 582-583, (2003).

"Magnetic field effects on the one-dimensional S=1/2 antiferromagnet Yb4As3"
M. Kohgi, K. Iwasa, J.-M. Mignot, A. Hiess, A. Ochiai and H. Aoki
Acta Physica Polonica B 34, 1217-1220, (2003).

"Magnetic excitations in the heavy-electron and antiferro- quadrupolar-ordering system PrFe4P12"
K. Iwasa, L. Hao, M. Nakajima, M. Kohgi, H. Sugawara, Y. Aoki, H. Sato and T. D. Matsuda
Acta Physica Polonica B 34, 1117-1120, (2003).

"High pressure X-Ray diffraction study of URu2Si2"
K. Kuwahara, H. Sagayama, K. Iwasa, M. Kohgi, S. Miyazaki, J. Nozaki, J. Nogami, M. Yokoyama, H. Amitsuka, H. Nakao and Y. Murakami
Acta Physica Polonica B 34, 4307-4310, (2003).

"Antiferro-quadrupolar ordering of 4f-electron state in the filled skutterudite PrFe4P12"
L. Hao, K. Iwasa, M. Nakajima, D. Kawana, K. Kuwahara, M. Kohgi, H. Sugawara, T. D. Matsuda, Y. Aoki and H. Sato
Acta Physica Polonica B 34, 1113-1116, (2003).

"Anisotropic Thermoelectric Properties of CeRhAs with superstructures"
T. Takabatake, T. Suemitsu, T. Sasakawa, J. Kitagawa, K. Umeo, M. Nakajima, K. Iwasa and M. Kohgi
Acta Physica Polonica B 34, 1303-1308, (2003).

"Successive phase transitions and energy-gap formation in CeRhAs"
T. Sasakawa, T. Suemitsu, T. Takabatake, Y. B and o, K. Umeo, M. H. Jung, M. Sera, T. Suzuki, T. Fujita, M. Nakajima, K. Iwasa, M. Kohgi, C. Paul, S. Berger and E. Bauer
Phys. Rev. B 66, 41103-1-4, (2002).

"Staggered-field effect on the magnetic-field-induced magnetization of the one-dimensional antiferromagnet Yb4As3"
K. Iwasa, M. Kohgi, A. Gukasov, J.-M. Mignot, N. Shibata, A. Ochiai, H. Aoki and T. Suzuki
Phys. Rev. B 65, 052408-1-4, (2002).

"Neutron scattering studies of the one-dimensional quantum spin magnetism in Yb4As3"
M. Koghi, K. Iwasa, J.-M. Mignot, A. Gukasov, B. Fak, A. Hiess, A. Ochiai and H. Aoki
Appl. Phys A74, s871-s873, (2002).

"High-pressure magnetic phase diagram of CeP studied by neutron diffraction"
A. Hannan, T. Osakabe, M. Koghi and K. Iwasa
Appl. Phys A74, s565-s567, (2002).

"EXCED-epithermal neutron diffractometer at KENS"
K. Kuwahara, S. Sugiyama, K. Iwasa, M. Kohgi, M. Nkamura, Y. Inamura, M. Arai and S. Knii
Appl. Phys A74, s302-s304, (2002).

"Direct observation of the modulation of the 4f-electron orbital state by strong p-f mixing in CeSb"
K. Iwasa, A. Hannan, M. Kohgi and T. Suzuki
Phys. Rev. Lett. 88, 207201-1-4, (2002).

"Crystal-lattice modulation and phonon anomaly associated with strong p-f mixing effect of CeSb"
K. Iwasa, A. Hannan, M. Kohgi, M. Braden, J.-M. Mignot, H. Kitazawa and T. Suzuki
Appl. Phys A74, s1779-s1781, (2002).

"Anomalous critical scattering from a three-dimensional percolating antiferromagnet RbMn0.31Mg0.69F3"
S. Itoh, K. Iwasa and M. J. Bull,
Appl.phys A74, ｓ789-ｓ791, (2002).

"Spin excitations of the one-dimensional S=1/2 Heisenberg antiferromagnet Yb4As3 under magnetic field"
M. Kohgi, K. Iwasa, J.-M. Mignot, B. Fak, A. Hiess, P. Gegenwart, M. Lang, A. Ochiai, H. Aoki and T. Suzuki
Physica B 312-313, 359-361, (2002).

"Magnetic form factor of UGe2 under high pressure"
K. Kuwahara, H. Sagayama, K. Iwasa, M. Kohgi, Y. Haga, Y. Onuki, K. Kakurai, M. Nishi, K. Nakajima, N. Aso and Y. Uwatoko
Physica B 312-313, 106-108, (2002).

"Crystal-structure modulation in the anomalous low-temperature phase of PrFe4P12"
K. Iwasa, Y. Watanabe, K. Kuwahara, M. Kohgi, H. Sugawara, T. D. Matsuda, Y. Aoki and H. Sato
Physica B 312-313, 834-836, (2002).

"Staggered field effect on the one-dimensional S=1/2 antiferromagnet Yb₄As₃"
M. Kohgi, K. Iwasa, J.-M. Mignot, B. Fak, P. Gegenwart, M. Lang, A. Ochiai, H. Aoki and T. Suzuki
Phys. Rev. Lett. 86, 2439-2442, (2001).

"One-Dimensional Magnetic State in the Charge-Ordered Phase of Yb₄As₃ Investigated by Polarized-Neutron Measurements"
K. Iwasa, M. Kohgi, A. Gukasov, J.-M. Mignot, N. Shibata, A. Ochiai, H. Aoki and T. Suzuki
J. Phys. Soc. Jpn. 70 Suppl. A, 112-114, (2001).

"Imaging of electron density distribution of CeP under high pressure by single crystal SR X-ray experiments"
T. Shobu, Y. Noda, K. Iwasa, A. Hannan, M. Kohgi, N. Ishimatsu and O. Shimomura
J. Phys. Soc. Jpn. 70, 1162-1163, (2001).

"Critical spin dynamics in the two-dimensional percolating Ising antiferromagnet, Rb2CocMg1-cF4"
S. Itoh, Y. Kouchi, S. Ikeda, K. Iwasa, H. Ikeda, M. A. Adams and R. Kajimoto
J. Phys. Soc. Jpn. 70, 3107-3111, (2001).

"Spin Dynamics of the Quantum Spin System Yb4As3 under Magnetic Field"
M. Kohgi, K. Iwasa, J.-M. Mignot, B. Fak, P. Gegenwart, M. Lang, A. Ochiai, H. Aoki and T. Suzuki
J. Phys. Soc. Jpn. 70 Suppl. A, 109-111, (2001).

"Polarized-neutron study of one-dimensional magnetic response under magnetic field in the charge-ordered phase of Yb4As3"
K. Iwasa, M. Kohgi, A. Gukasov, J.-M. Mignot, N. Shibata, A. Ochiai, H. Aoki and T. Suzuki
J. Magn. Magn. Mater. 226-230, 441-443, (2001).

"Magnetic Form Factor in UGe2"
H. Sagayama, K. Kuwahara, K. Iwasa, M. Kohgi, Y. Haga, Y. Onuki, K. Kakurai, M. Nishi, K. Nakajima and N. Aso
J. Phys. Soc. Jpn. 70 Suppl. A, 28-30, (2001).

"Crystal-lattice anomaly of CeSb under high pressure induced by magnetic polaron formation"
A. Hannan, K. Iwasa, M. Kohgi and T. Suzuki
J. Phys. Soc. Jpn. 69, 2358-2359, (2000).

"Physics of low-carrier system detected by neutron and X-ray scattering: Ce-monopnictides case"
M. Kohgi, K. Iwasa and T. Osakabe
Physica B 281&282, 417-422, (2000).
"Magnetic structure of CeAs under high pressure"
T. Osakabe, M. Kohgi, K. Iwasa, M. Kubota, H. Yoshizawa, Y. Haga and T. Suzuki
Physica B 281-282, 434-436, (2000).

"Magnetic states of Yb ions in the charge ordered phase of Yb4As3 determined by polarized-neutron scattering"
K. Iwasa, M. Kohgi, A. Gukasov, J.-M. Mignot, A. Ochiai, H. Aoki and T. Suzuki
Physica B 281-282, 460-461, (2000).

"Crystal-lattice modulations associated with unusual magnetic structures in the low-carrier system CeSb"
K. Iwasa, Y. Arakaki, M. Kohgi and T. Suzuki
Physica B 281&282, 437-439, (2000).

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