桑原慶太郎 (keitaro KUWAHARA) - マイポータル

基本情報

所属: 茨城大学理工学研究科（理学野）物理学領域教授
: (兼任)フロンティア応用原子科学研究センター

学位: 博士（理学）(1999年3月北海道大学)

研究者番号: 90315747
J-GLOBAL ID: 201201039325661531
researchmap会員ID: 7000001287

研究分野

自然科学一般 / 磁性、超伝導、強相関系 / 物性Ⅱ

論文

Magnetic Ordering and Structural Phase Transitions of Nd3T4Sn13 (T = Rh and Ir)

Ami Shimoda, Kazuaki Iwasa, Keitaro Kuwahara, Hajime Sagayama, Hironori Nakao, Motoyuki Ishikado, Takashi Ohhara, Akiko Nakao, Akinori Hoshikawa, and Toru Ishigaki

JPS Conference Proceedings 38 011091-1-011091-6 2023年5月23日査読有り
Gaps in topological magnon spectra: Intrinsic versus extrinsic effects

Seung-Hwan Do, Joseph A. M. Paddison, Gabriele Sala, Travis J. Williams, Koji Kaneko, Keitaro Kuwahara, Andrew F. May, Jiaqiang Yan, Michael A. McGuire, Matthew B. Stone …

PHYSICAL REVIEW B 106 L060408-1-L060408-6 2022年8月24日査読有り
Magnetic Excitations in Chiral-Structure Phase of Ce3Ir4Sn13

Kazuaki Iwasa, Seiya Nakazato, Daisuke Hashimoto, Mami Shiozawa, Keitaro Kuwahara, Hajime Sagayama, Seiko Ohira-Kawamura, Naoki Murai, Devashibhai T. Adroja, and André M. Strydom

Journal of the Physical Society of Japan 90 124701-1-124701-9 2021年11月2日査読有り
Helical and Collinear Spin-Density-Wave Orders in S = 1/2 One-dimensional Frustrated Chain Compound NaCuMoO4(OH) Investigated by Neutron Scattering

Shinichiro Asai, Takuma Oyama, Kazuhiro Nawa, Akiko Nakao, Koji Munakata, Keitaro Kuwahara, Masato Hagihala, Shinichi Itoh, Zenji Hiroi, Takatsugu Masuda

Physical Review B 101 144437-1-144437-8 2020年4月28日査読有り
Single-Crystal Growth and Physical Properties of EuZn2Ge2

Masashi Kosakaa, Shinji Michimura, Hikaru Hirabayashi, Ryosuke Numakura, Ryosuke Iizuka, Keitaro Kuwahara, Yoshiya Uwatoko

Journal of the Physical Society of Japan 89 054704-1-054704-8 2020年4月8日査読有り
Successive Phase Transitions in R3Ir4Sn13 (R: La and Ce) Investigated Using Neutron and X-ray Diffraction

Seiya Nakazato, Kazuaki Iwasa, Daisuke Hashimoto, Mami Shiozawa, Keitaro Kuwahara, Hironori Nakao, Hajime Sagayama, Motoyuki Ishikado, Takashi Ohhara, Akiko Nakao …

JPS Conf. Proc. 30 011128-1-011128-6 2020年3月19日査読有り
URu2Si2 under intense magnetic fields: From hidden order to spin-density wave

W. Knafo, D. Aoki, G.W. Scheerer, F. Duc, F. Bourdarot, K. Kuwahara, H. Nojiri, L.-P. Regnault, J.Flouquet

Physica B 536 457-460 2018年5月1日査読有り
Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9

S. Ito, N. Kurita, H. Tanaka, S. Ohira-Kawamura, K. Nakajima, S. Itoh, K. Kuwahara, K. Kakurai

Nature Communications 8 235 2017年8月10日査読有り
First report on the Electronic, Magnetic and thermal Properties of Filled Skutterudite YbOs4Sb12

H. Kunitoshi, T. D. Matsuda, R. Midorikawa, R. Higashinaka, K. Kuwahara, Y. Aoki, H. Sato

Journal of the Physical Society of Japan 85(11) 114708 2016年査読有り
Field-induced spin-density wave beyond hidden order in URu2Si2

W. Knafo, F. Duc, F. Bourdarot, K. Kuwahara, H. Nojiri, D. Aoki, J. Billette, P. Frings, X. Tonon, E. Lelièvre-Berna …

Nature Communications 7 13075 2016年査読有り
Intermultiplet transitions in filled skutterudite SmFe4P12

S. Konno, A. Suzuki, K. Nihei, K. Kuwahara, D. Kawana, T. Yokoo and S. Itoh

Journal of Physics: Conference Series 592 012029 (6pp) 2015年
Science from the Initial Operation of HRC

S. Itoh, T. Yokoo, T. Masuda, H. Yoshizawa, M. Soda, Y. Ikeda, S. Ibuka, D. Kawana, T. J. Sato, Y. Nambu …

JPS Conference Proceedings 8 034001 (6 pages) 2015年
Electronic State of CeFe4As12 Investigated by Using Single Crystals Grown under High Pressure of 4 GPa

Y. Ogawa, H. Sato, M. Watanabe, T. Namiki, S. Tatsuoka, R. Higashinaka, Y. Aoki, K. Kuwahara, J. Yamaura, and Z. Hiroi

Journal of the Physical Society of Japan 83(3) 034710 (7 pages) 2014年2月21日
Magnetic Structure of Phase II in U(Ru0.96Rh0.04)(2)Si-2 Determined by Neutron Diffraction under Pulsed High Magnetic Fields

K. Kuwahara, S. Yoshii, H. Nojiri, D. Aoki, W. Knafo, F. Duc, X. Fabreges, G. W. Scheerer, P. Frings, G. L. J. A. Rikken …

PHYSICAL REVIEW LETTERS 110(21) 216406 (4 pages) 2013年5月
Magnetic Excitation in Totally Symmetric Staggered Ordered Phase of PrFe4P12

K. Iwasa, L. Hao, M. Kohgi, K. Kuwahara, J.-M. Mignot, H. Sugawara, Y. Aoki, T.D. Matsuda, and H. Sato

Journal of the Physical Society of Japan 81(9) 094711 (9 pages) 2012年
Neutron scattering study on magnetic ordering in a partially rare-earth filled skutterudite PrxFe4Sb12

K. Iwasa, T. Orihara, K. Saito, K. Tomiyasu, Y. Murakami, H. Sugawara, K. Kuwahara, H. Kimura, R. Kiyanagi, Y. Ishikawa …

Journal of Physics: Conference Series 391 012025 (4pp) 2012年
Renormalized Motion of Dysprosium Atoms Filling Boron Cages of DyB6

K. Iwasa, K. Kuwahara, Y. Utsumi, K. Saito, H. Kobayashi, T. Sato, M. Amano, T. Hasegawa, N. Ogita, M. Udagawa …

Journal of the Physical Society of Japan 81(11) 113601 (4 pages) 2012年
Strong Effect of Yb Filling Fraction on the Magnetic Ground Sate of the Filled Skutterudite YbFe4Sb12

T. Saito, H. Sato, K. Tanaka, S. Tatsuoka, M. Ueda, R. Higashinaka, T. Namiki, Y. Aoki, Y. Utsumi, K. Kuwahara …

Journal of the Physical Society of Japan 80(6) 063708 (4 pages) 2011年
Motion of the guest ion as precursor to the first-order phase transition in the cage system GdB6

K. Iwasa, R. Igarashi, K. Saito, C. Laulhé, T. Orihara, S. Kunii, K. Kuwahara, H. Nakao, Y. Murakami, F. Iga …

Physical Review B 84(21) 214308 (6 pages) 2011年
Pressure-Induced Antiferromagnetic Order in Filled Skutterudite PrFe4P12 Studied by Single-Crystal High-Pressure Neutron Diffraction

T. Osakabe, K. Kuwahara, D. Kawana, K. Iwasa, D. Kikuchi, Y. Aoki, M. Kohgi and H. Sato

Journal of the Physical Society of Japan 79(3) 034711 (7 pages) 2010年

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