Study on novel magnetic order and transport properties in pyrochlore iridium oxides

• Project/Area Number: 15H03692
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: MATSUHIRA KAZUYUKI 九州工業大学, 大学院工学研究院, 教授 (40312342)
• Co-Investigator(Kenkyū-buntansha): 富安 啓輔 株式会社日産アーク(マテリアル解析部、デバイス機能解析部), マテリアル解析部,デバイス機能解析部, 主任研究員 (20350481) ; 渡邊 功雄 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 専任研究員 (40260195) ; 小野田 繁樹 国立研究開発法人理化学研究所, 開拓研究本部, 専任研究員 (70455335)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2017: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2016: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2015: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
• Keywords: パイロクロア / イリジウム酸化物 / 中性子散乱 / ミュオンスピン緩和 / 第一原理電子状態計算 / 金属絶縁体転移 / パイロクロア酸化物 / 磁気構造解析法 / 偏極中性子散乱 / 第一原理計算 / 強相関電子系 / フラストレート系 / パイロクロア型酸化物 / 磁気秩序 / 中性子回折 / パイロクア型酸化物

Outline of Final Research Achievements

The metal-insulator transition of pyrochlore iridates was researched in conjunction with various measurement methods and a theoretical method based on first principles calculation.
The magnetic structure of pyrochlore iridates was clarified from polarized neutron diffraction and muon spin relaxation, which can microscopically measure the spin state of electrons. The first-principles calculations on the electronic state revealed that increasing the on-site Coulomb interaction U changes from paramagnetic semimetal to antiferromagnetic semimetal, from antiferromagnetic semimetal to antiferromagnetic insulator.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的な意義は，スピン軌道相互作用が大きい5d遷移金属酸化物であるイリジウム酸化物において，幾何学的なフラストレーションを示すパイロクロア型構造を有する物質の基底状態の磁気構造を実験的に解明することができたことである。また，第一原理電子状態計算からも，実験結果と対応するようにオンサイトクーロン相互作用Uにより基底状態が変化することを理論的に解明したことは，学術的に大きな成果と考えられる。

Research Products

• [Int'l Joint Research] Oak Ridge National Laboratory(米国)
• [Int'l Joint Research] Paul Sherrer Institut(スイス)
• [Int'l Joint Research] Rutherford-Appleton Laboratory(英国)
• [Int'l Joint Research] Oak Ridge National Laboratory(米国)
• [Int'l Joint Research] ANSTO(オーストラリア)
• [Int'l Joint Research] Rutherford-Appleton Laboratory(英国)
• [Int'l Joint Research] Paul Sherrer Institut (PSI)(スイス)
• [Int'l Joint Research] Universiti Sains Malaysia（USM(マレーシア)
• [Int'l Joint Research] Oak Ridge National Laboratory(米国)
• [Int'l Joint Research] ANSTO(オーストラリア)
• [Int'l Joint Research] Paul Sherrer Institut(スイス)
• [Int'l Joint Research] Rutherford- Appleton Laboratory(英国)
• [Int'l Joint Research] OakRidge National Laboratory(米国)
• [Int'l Joint Research] Institut Neel(フランス)
• [Int'l Joint Research] Chinese Academy of Sciences(中国)
• [Int'l Joint Research] Paul Sherrer Institut(スイス)
• [Int'l Joint Research] Rutherford-Appleton Laboratory(英国)
• [Journal Article] Carrier doping effect of magnetic and transport properties on the geometrically frustrated iridate Ca5Ir3O12 (2019)
  • Author(s): Haneta Sho、Yasukuni Yuki、Oka Chiharu、Wakeshima Makoto、Hinatsu Yukio、Matsuhira Kazuyuki
  • Journal Title: Journal of Magnetism and Magnetic Materials Volume: 476 Pages: 274-277
  • DOI: 10.1016/j.jmmm.2018.12.023
  • NAID: 120006940305
  • Peer Reviewed
• [Journal Article] First-Principles Design of the Spinel Iridate Ir2O4 for High-Temperature Quantum Spin Ice (2019)
  • Author(s): Onoda Shigeki、Ishii Fumiyuki
  • Journal Title: Physical Review Letters Volume: 122 Issue: 6 Pages: 067201-067201
  • DOI: 10.1103/physrevlett.122.067201
  • Peer Reviewed
• [Journal Article] Magnetic Properties of Hole-Doped Pyrochlore Iridate (Y1-x-yCuxCay)2Ir2O7 (2019)
  • Author(s): Julia Angel, Retno Asih, Hironori Nomura, Tomoya Taniguchi, Kazuyuki Matsuhira, Muhammad Redo Ramadhan, Irwan Ramli, Makoto Wakeshima, Yukio Hinatsu, Mohamed Ismail Mohamed-Ibrahim, Shukri Sulaiman and Isao Watanab
  • Journal Title: Key Engineering Materials Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A new mathematical approach to finding global solutions of the magnetic structure determination problem (2018)
  • Author(s): K. Tomiyasu, R. Oishi-Tomiyasu, M. Matsuda, and K. Matsuhira
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 16228-16228
  • DOI: 10.1038/s41598-018-34443-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quantum paramagnet near spin-state transition (2018)
  • Author(s): K. Tomiyasu, N. Ito, R. Okazaki, Y. Takahashi, M. Onodera, K. Iwasa, T. Nojima, T. Aoyama, K. Ohgushi, Y. Ishikawa, T. Kamiyama, S. Ohira-Kawamura, M. Kofu and S. Ishihara
  • Journal Title: Advanced Quantum Technology Volume: 2018 Issue: 3 Pages: 1800057-1800057
  • DOI: 10.1002/qute.201800057
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic Properties of One-Dimensional Quantum Spin System Rb2Cu2Mo3O12 Studied by Muon Spin Relaxation (2018)
  • Author(s): S. Ohira-Kawamura, K. Tomiyasu, A. Koda, D. P. Sari, R. Asih, S. Yoon, I. Watanabe, and K. Nakajima
  • Journal Title: JPS Conf. Proc. Volume: 21 Pages: 11007-11007
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Excitonic dispersion of the intermediate spin state in LaCoO3 revealed by resonant inelastic x-ray scattering (2018)
  • Author(s): Ru-Pan Wang, Atsushi Hariki, Andrii Sotnikov, Federica Frati, Jun Okamoto, Hsiao-Yu Huang, Amol Singh, Di-Jing Huang, Keisuke Tomiyasu, Chao-Hung Du, Jan Kune?, and Frank M. F. de Groot
  • Journal Title: Phys. Rev. B Volume: 98 Issue: 3 Pages: 35149-35149
  • DOI: 10.1103/physrevb.98.035149
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Chiral-crystal-structure transformations and magnetic states of R3Rh4Sn13 (R=La and Ce) (2018)
  • Author(s): Kazuya Suyama, Kazuaki Iwasa, Yuka Otomo, Keisuke Tomiyasu, Hajime Sagayama, Ryoko Sagayama, Hironori Nakao, Reiji Kumai, Yoshinori Kitajima, Fran?oise Damay, Jean-Michel Mignot, Akira Yamada, Tatsuma D. Matsuda, and Yuji Aoki
  • Journal Title: Phys. Rev. B Volume: 97 Issue: 23 Pages: 231538-231538
  • DOI: 10.1103/physrevb.97.235138
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nonlinear Conductivity of Geometrically Frustrated Iridate Ca5Ir3O12 (2018)
  • Author(s): Matsuhira Kazuyuki、Nakamura Kazuma、Yasukuni Yuki、Yoshimoto Yoshihide、Hirai Daigorou、Hiroi Zenji
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 1 Pages: 013703-013703
  • DOI: 10.7566/jpsj.87.013703
  • NAID: 210000134653
  • Peer Reviewed
• [Journal Article] Cluster-Based Haldane State in an Edge-Shared Tetrahedral Spin-Cluster Chain: Fedotovite K2Cu3O(SO4)3 (2018)
  • Author(s): Fujihala M.、Sugimoto T.、Tohyama T.、Mitsuda S.、Mole R.?A.、Yu D.?H.、Yano S.、Inagaki Y.、Morodomi H.、Kawae T.、Sagayama H.、Kumai R.、Murakami Y.、Tomiyasu K.、Matsuo A.、Kindo K.
  • Journal Title: Physical Review Letters Volume: 120 Issue: 7 Pages: 77201-77201
  • DOI: 10.1103/physrevlett.120.077201
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic moments and ordered states in pyrochlore iridates Nd2Ir2O7 and Sm2Ir2O7 studied by muon-spin relaxation (2017)
  • Author(s): R. Asih, N. Adam, S. S. M. Tajudin, D. P. Sarid, K. Matsuhira, H. Guo, M. Wakeshima, Y. Hinatsu, T. Nakano, Y. Nozue, S. Sulaiman, M. I. M. Ibrahim, P. K. Biswas, I. Watanabe
  • Journal Title: J. Phys. Soc. Jpn. Volume: 86 Issue: 2 Pages: 0247051-7
  • DOI: 10.7566/jpsj.86.024705
  • NAID: 210000134266
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4 (2017)
  • Author(s): M. Fujihala, H. Koorikawa, S. Mitsuda, K. Morita, T. Tohyama, K. Tomiyasu, A. Koda, H. Okabe, S. Itoh, T. Yokoo, S. Ibuka, M. Tadokoro, M. Itoh, H. Sagayama, R. Kumai, and Y. Murakami
  • Journal Title: Scientific Reports Volume: 7 Issue: 1
  • DOI: 10.1038/s41598-017-16935-9
  • Peer Reviewed
• [Journal Article] Coulomb Correlations Intertwined with Spin and Orbital Excitations in LaCoO3 (2017)
  • Author(s): K. Tomiyasu, J. Okamoto, H. Y. Huang, Z. Y. Chen, E. P. Sinaga, W. B. Wu, Y. Y. Chu, A. Singh, R.-P. Wang, F. M. F. de Groot, A. Chainani, S. Ishihara, C. T. Chen, and D. J. Huang
  • Journal Title: Phys. Rev. Lett. Volume: 119 Issue: 19
  • DOI: 10.1103/physrevlett.119.196402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Properties of Electron-Doped LaCoO3 (2017)
  • Author(s): Tomiyasu Keisuke、Sato Mika、Koyama Shun-Ichi、Nojima Tsutomu、Kajimoto Ryoichi、Ji Sungdae、Iwasa Kazuaki
  • Journal Title: Journal of the Physical Society of Japan Volume: 86 Issue: 9 Pages: 094706-094706
  • DOI: 10.7566/jpsj.86.094706
  • NAID: 210000134508
  • Peer Reviewed
• [Journal Article] Crystal-electric-field excitations and spin dynamics in Ce3Co4Sn13 semimetallic chiral-lattice phase (2017)
  • Author(s): Iwasa Kazuaki、Otomo Yuka、Suyama Kazuya、Tomiyasu Keisuke、Ohira-Kawamura Seiko、Nakajima Kenji、Mignot Jean-Michel
  • Journal Title: Physical Review B Volume: 95 Issue: 19
  • DOI: 10.1103/physrevb.95.195156
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Microscopic Examinations of Co Valences and Spin States in Electron-Doped LaCoO3 (2016)
  • Author(s): 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, and Youichi Murakami
  • Journal Title: Journal of the Physical Society of Japan Volume: 85 Issue: 9 Pages: 094702-094702
  • DOI: 10.7566/jpsj.85.094702
  • NAID: 210000134085
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] First-principles study on cubic pyrochlore iridates Y2Ir2O7 and Pr2Ir2O7 (2015)
  • Author(s): F. Ishii, Y.P. Mizuta, T. Kato, T. Ozaki, H. Weng, and S. Onoda
  • Journal Title: Journal of the Physical Society of Japan Volume: 84 Issue: 7 Pages: 073703-073703
  • DOI: 10.7566/jpsj.84.073703
  • NAID: 210000133609
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Novel Transport and Magnetic Properties of Geometrically Frustrated Iridate Ca5Ir3O12 (2019)
  • Author(s): Kazuyuki Matsuhira, Hiroki Hanate, Kazuma Nakamura, Yoshihide Yoshimoto, Daigoro Hirai, Zenji Hiroi
  • Organizer: International Workshop on Topological Quantum Materials, NCKU, Tainan, Taiwan
  • Int'l Joint Research / Invited
• [Presentation] μSR Study on Magnetic Orderings in (Eu,Ca)2Ir2O7 (2019)
  • Author(s): Utami Widyaiswari, Julia Angel, Hironori Nomura, Tomoya Taniguchi, Kazuyuki Matsuhira, Isao Watanabe
  • Organizer: 第74回日本物理学会年次大会
• [Presentation] μSR Study on Magnetic Ordering in (Eu,Ca)2Ir2O7 (2019)
  • Author(s): U. Widyaiswari, J. Angel, H. Nomura, T. Taniguchi, K. Matsuhira, B. Kurniawan, I. Watanabe
  • Organizer: International Workshop on Topological Quantum Materials, NCKU, Tainan, Taiwan
  • Int'l Joint Research
• [Presentation] Magnetic Properties of Hole-doped Pyrochlore Iridate Y2-x-yCuyCaxIr2O7 (2019)
  • Author(s): J. Angel, H. Nomura, T. Taniguchi, K. Matsuhira,M. Wakeshima, Y. Hinatsu, I. Watanabe
  • Organizer: International Workshop on Topological Quantum Materials, NCKU, Tainan, Taiwan
  • Int'l Joint Research
• [Presentation] 幾何学的フラストレート系イリジウム酸化物の磁性と輸送特性 (2018)
  • Author(s): 松平和之, Retno Asih, 渡邊功雄，花手洋樹，平井大悟郎，廣井善二
  • Organizer: 第28回日本MRS年次大会 シンポジウム「特異なスピン構造から創発する物質の新しい性質と機能性」(招待講演)
  • Invited
• [Presentation] Strongly correlated metallic state in doped pyrochlore iridates Y2Ir2O7 (2018)
  • Author(s): Kazuyuki Matsuhira, Tomoya Taniguchi, Hironori Nomura, Reo Shibahara, Julia Angel, R. Asia, Isao Watanabe
  • Organizer: International Conference on Highly Frustrated Magnetism 2018
  • Int'l Joint Research
• [Presentation] Nonlinear conductivity of frustrated iridate Ca5Ir3O12 (2018)
  • Author(s): Kazuyuki Matsuhira, Kazuma Nakamura, Yuki Yasukuni, Yoshihide Yoshimoto, Daigoro Hirai, Zenji Hiroi
  • Organizer: International Conference on Highly Frustrated Magnetism 2018
  • Int'l Joint Research
• [Presentation] Carrier doping effect of magnetic and transport properties on the geometrically frustrated iridate Ca5Ir3O1 (2018)
  • Author(s): Haneta Sho、Yasukuni Yuki、Oka Chiharu、Wakeshima Makoto、Hinatsu Yukio, Kazuyuki Matsuhira
  • Organizer: 9th Joint European Magnetic Symposia Conference 2018
  • Int'l Joint Research
• [Presentation] Non-Fermi liquid behavior realized in doped pyrochlore Y2Ir2O7 (2018)
  • Author(s): Tomoya Taniguchi, Hironori Nomura, Julia Angel, Retno Asih, Isao Watanabe, Kazuyuki Matsuhira
  • Organizer: 9th Joint European Magnetic Symposia Conference 2018
  • Int'l Joint Research
• [Presentation] Non-Fermi liquid behavior in doped pyrochlore iridate Y2Ir2O7 (2018)
  • Author(s): 野村拡功，谷口智哉, Julia Angel, Retno Asih, 渡邊功雄, 松平和之
  • Organizer: 第28回日本MRS年次大会 シンポジウム「特異なスピン構造から創発する物質の新しい性質と機能性」
• [Presentation] 超高分解能粉末中性子回折によるスピネルFeCr2O4の磁気構造研究 (2018)
  • Author(s): 富安啓輔, 石橋広記, Sanghyun Lee, 萩原雅人, 鳥居周輝, 神山崇
  • Organizer: 日本物理学会2018年秋季大会, 同志社大（京田辺キャンパス）
• [Presentation] 中性子非弾性散乱と理論計算の融合によるLaCoO3の研究 (2018)
  • Author(s): 富安啓輔, 野村拓司, 小林義彦, 古府麻衣子, 河村聖子
  • Organizer: 日本物理学会2018年秋季大会, 同志社大（京田辺キャンパス）
• [Presentation] コバルト酸化物LaCoO3とLa(Co0.99Ni0.01)O3の弾性異常 (2018)
  • Author(s): 岡田竜一, 渡辺忠孝, 富安啓輔
  • Organizer: 日本物理学会2018年秋季大会, 同志社大（京田辺キャンパス）
• [Presentation] Magnetically Ordered States in Holed-doped Pyrochlore Iridate (Y0.95-xCu0.05Cax)2Ir2O7 (2018)
  • Author(s): J. Angel, H. Nomura, T. Taniguchi, K. Matsuhira,, I. Watanabe
  • Organizer: 日本物理学会2018年秋季大会, 同志社大（京田辺キャンパス）
• [Presentation] Magnetic Properties of Hole-doped Pyrochlore Iridate (Y1-x-yCuxCay)2Ir2O7 (2018)
  • Author(s): J. Angel, R. Asih, H. Nomura, T. Taniguchi, K. Matsuhira, M. Redo Ramadhan, Irwan Ramli, M. Wakeshima, Y. Hinatsu, M. Ismail Mohamed-Ibrahim, S. Sulaiman, I. Watanabe
  • Organizer: 4th International Conference for Functional Materials Science 2018, Sanur, Bali, Indonesia
  • Int'l Joint Research
• [Presentation] 幾何学的フラストレート系イリジウム酸化物Ca5Ir3O12の非線形伝導 (2018)
  • Author(s): 松平和之，吉田航，安國友貴，中村和磨，吉本芳英，平井大悟郎，廣井善二
  • Organizer: 日本物理学会第７３回年次大会 東京理科大学野田キャンパス，野田
• [Presentation] Magnetic ordered states of hole doped pyrochlore iridates (Nd1-xCax)2Ir2O7 studied by μSR (2017)
  • Author(s): R. Asih, J. Angel, S. Maeda, D. P. Sari, F. Astuti, K. Matsuhira, M. Wakeshima, Y. Hinatsu, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学（豊中市）
  • Year and Date: 2017-03-18
• [Presentation] The Magnetically Ordered States in Hole-Doped Pyrochlore Iridate Y2Ir2O7 (2017)
  • Author(s): J. Angel, R. Asih, R. Shibahara, K. Matsuhira, T. Sakakibara, I. Watanabe
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学（豊中市）
  • Year and Date: 2017-03-18
• [Presentation] First-principles design of spinel iridate Ir2O4 for high-temperature quantum spin ice (2017)
  • Author(s): Shigeki Onoda, Fumiyuki Ishii
  • Organizer: American Physical Society March Meeting 2017
  • Place of Presentation: New Orleans, USA
  • Year and Date: 2017-03-15
  • Int'l Joint Research
• [Presentation] μSR study on magnetic ordered states of pyrochlore iridates Nd2Ir2O7 and Sm2Ir2O7 (2017)
  • Author(s): R. Asih, S. S. Mohd-Tajudin, F. Astuti, S. Maeda, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: The 37th REIMEI Workshop on Frontiers of Correlated Quantum Matters and Spintronics The DMREF-FCMP Symposium on Mott Transitions and Computational Approaches
  • Place of Presentation: Conference Hall at Advanced Science Research Center JPARC, iVil Hall- Tokai, and Takeda Hall in Univ. of Tokyo
  • Year and Date: 2017-01-13
  • Int'l Joint Research
• [Presentation] Metal-insulator Transition and magnetic Properties of the Pyrochlore Iridates Ln2Ir2O7 (2017)
  • Author(s): 松平和之
  • Organizer: School Seminar in International Workshop on Organic Molecule Systems,Universiti Sains Malaysia (USM), Penang, Malaysia
  • Int'l Joint Research / Invited
• [Presentation] 幾何学的フラストレート系イリジウム酸化物Ca5Ir3O12の磁性と電気伝導 (2017)
  • Author(s): 松平和之，安國友貴，中村和磨，吉本芳英，平井大悟郎，廣井善二
  • Organizer: 日本物理学会2017年秋季大会 岩手大学，盛岡
• [Presentation] パイロクロア型イリジウム酸化物Y2Ir2O7のホールドープ効果 (2017)
  • Author(s): 谷口智哉，野村拡功，柴原怜央，松平和之
  • Organizer: 第１２３回日本物理学会九州支部例会，鹿児島大学
• [Presentation] Magnetic ordered states of hole doped pyrochlore iridates (Nd1-xCax)2Ir2O7 studied by μSR (2017)
  • Author(s): R. Asih, S. Maeda, D. P. Sari, J. Angel, F. Astuti, K. Matsuhira, M. Wakeshima, Y. Hinatsu, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: nternational Workshop on Organic Molecular Systems,Penang, Malaysia
  • Int'l Joint Research
• [Presentation] Magnetically Ordered States in Hole-Doped Pyrochlore Iridate (Y1-x-yCuxCay)2Ir2O7 (2017)
  • Author(s): J. Angel, R. Asih, R. Shibahara, K. Matsuhira, I. Watanabe, T. Sakakibara
  • Organizer: nternational Workshop on Organic Molecular Systems,Penang, Malaysia
  • Int'l Joint Research
• [Presentation] Magnetic ordered states of hole-doped pyrochlore (Nd1-xCax)2Ir2O7 studied by μSR (2017)
  • Author(s): R. Asih, J. Angel, S. Maeda, D. P. Sari, F. Astuti, K. Matsuhira, M. Wakeshima, Y. Hinatsu, I. Watanabe, T. Nakano and Y. Nozue
  • Organizer: The 3rd Emallia Conference, 釜山、韓国
  • Int'l Joint Research
• [Presentation] Magnetically Ordered States in Hole-Doped Pyrochlore Iridate Y2Ir2O7 (2017)
  • Author(s): Julia Angel, Retno Asih, K. Matsuhira and Isao Watanabe
  • Organizer: The 3rd Emallia Conference, 釜山、韓国
  • Int'l Joint Research
• [Presentation] Quest to U(1) quantum spin liquids, valence bond solids, and novel ordered phases in pyrochlores and spinels: unconventional quasiparticles and interference effects (2017)
  • Author(s): Shigeki Onoda
  • Organizer: Junjiro Kanamori Memorial International Symposium, Univ. of Tokyo, Tokyo
  • Int'l Joint Research / Invited
• [Presentation] Quest to U(1) quantum spin liquids, valence bond solids, novel ordered phases in pyrochlores and spinels: unconventional quasiparticles and interference effects (2017)
  • Author(s): Shigeki Onoda
  • Organizer: Kavli Institute for Theoretical Sciences, Univ. of Chinese Academy of Sciences
  • Int'l Joint Research / Invited
• [Presentation] "Quantum spin ice" Part I,II, and III (2017)
  • Author(s): Shigeki Onoda
  • Organizer: Frustrated Magnetism: School,Institute of Mathematical Sciences (IMSc), Chennai, India
  • Int'l Joint Research / Invited
• [Presentation] Sc置換LaCoO3における磁化と体積磁歪 スピン状態転移近傍に現れる励起子絶縁体の候補物質としての検討 (2017)
  • Author(s): 富安啓輔, 伊藤菜緒子, 岡崎竜二, 高橋佑生, 岩佐和晃, 野島勉, 青山拓也, 石原純夫, 大串研也
  • Organizer: 日本物理学会2017年秋季大会, 岩手大上田キャンパス
• [Presentation] LaCo1-yScyO3の輸送現象と電荷励起ギャップ (2017)
  • Author(s): 伊藤菜緒子, 岡崎竜二, 高橋佑生, 富安啓輔
  • Organizer: 日本物理学会2017年秋季大会, 岩手大上田キャンパス
• [Presentation] 元素置換したLuCoO3の磁性と電気伝導 (2017)
  • Author(s): 長内一将, 富安啓輔, 大串研也
  • Organizer: 日本物理学会2017年秋季大会, 岩手大上田キャンパス
• [Presentation] 超高分解能粉末中性子回折によるスピネルCuCr2O4の磁気構造 (2017)
  • Author(s): 富安啓輔, Sanghyun Lee, 石橋広記, 高橋佑生, 鳥居周輝, 神山崇
  • Organizer: 日本物理学会2017年秋季大会, 岩手大上田キャンパス
• [Presentation] ペロブスカイト型酸化物LaCoO3とLa(Co1-xNix)O3の弾性異常 (2017)
  • Author(s): 岡田竜一, 渡辺忠孝, 富安啓輔
  • Organizer: 日本物理学会2017年秋季大会, 岩手大上田キャンパス
• [Presentation] フラストレートスピン1/2ラダーRb2Cu2Mo3O12に現れるスピン1ハルデンギャップと強誘電性 (2017)
  • Author(s): 上田宏, 小野田繁樹, 山口泰弘, 木村剛, 吉澤大智, 森岡俊晶, 萩原政幸, 萩原雅人, 左右田稔, 益田隆嗣, 榊原俊郎, 富安啓輔, 河村聖子, 中島健次, 梶本亮一, 中村充孝, 稲村泰弘, 長谷正司, 安井幸夫
  • Organizer: 日本物理学会第73回年次大会, 東京理科大（野田キャンパス）
• [Presentation] LaCoO3の単結晶非弾性中性子散乱研究 (2017)
  • Author(s): 富安啓輔, 小林義彦, 古府麻衣子, 川村聖子, 石原純夫
  • Organizer: 日本物理学会第73回年次大会, 東京理科大（野田キャンパス）
• [Presentation] Investigation of magnetic ordered states in the pyrochlore iridates (Nd1-xCax)2Ir2O7 (2016)
  • Author(s): R. Asih, N. Adam, S. S. Mohd-Tajudin, S. Maeda, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: Emallia Conference
  • Place of Presentation: Graduate School of Science, Hokkaido University, Sapporo
  • Year and Date: 2016-12-19
• [Presentation] キャリアドープによるパイロクロア型イリジウム酸化物の量子臨界現象の研究 (2016)
  • Author(s): 柴原怜央,山本祥子, 前田賢, 分島亮,日夏幸雄, 三宅厚志,徳永将史,松平和之
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（金沢市）
  • Year and Date: 2016-09-14
• [Presentation] パイロクロア酸化物Ln2Ir2O7における金属絶縁体転移 (2016)
  • Author(s): 松平和之
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（金沢市）
  • Year and Date: 2016-09-14
  • Invited
• [Presentation] μSR study on the magnetic ordered states of (Nd1-xCax)2Ir2O7 (2016)
  • Author(s): R. Asih, S. S. Mohd-Tajudin, F. Astuti, S. Maeda, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（金沢市）
  • Year and Date: 2016-09-14
• [Presentation] Study on Quantum Critical Phenomena in the Doped Pyrochlore Iridates (2016)
  • Author(s): R. Shibahara, S. Yamamoto, S. Maeda , M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, K. Matsuhira
  • Organizer: The 8th International Conference on Highly Frustrated Magnetism (HFM 2016)
  • Place of Presentation: NTU Convention Center, Taipei, Taiwan
  • Year and Date: 2016-09-08
  • Int'l Joint Research
• [Presentation] Magnetic ordered states in pyrochlore iridates Nd2Ir2O7 and Sm2Ir2O7 studied by μSR (2016)
  • Author(s): R. Asih, N. Adam, S.S. Mohd-Tajudin, D.P. Sari, K. Matsuhira, H. Guo, M. Wakeshima, Y. Hinatsu, T. Nakano, Y. Nozue, S. Sulaiman, M.I. Mohamed-Ibrahim, P.B. Kumar, and I. Watanabe
  • Organizer: The 8th International Conference on Highly Frustrated Magnetism (HFM 2016)
  • Place of Presentation: NTU Convention Center, Taipei, Taiwan
  • Year and Date: 2016-09-07
  • Int'l Joint Research
• [Presentation] First-principles design for high-temperature quantum spin ice in Ir2O4 (2016)
  • Author(s): Shigeki Onoda, Fumiyuki Ishii
  • Organizer: The 8th International Conference on Highly Frustrated Magnetism (HFM 2016)
  • Place of Presentation: NTU Convention Center, Taipei, Taiwan
  • Year and Date: 2016-09-07
  • Int'l Joint Research
• [Presentation] Magnetic ordered states in pyrochlore iridates R2Ir2O7 (R = Nd and Sm) investigated by μSR (2016)
  • Author(s): R. Asih, N. Adam, S.S. Mohd-Tajudin, D.P. Sari, K. Matsuhira, H. Guo, M. Wakeshima, Y. Hinatsu, T. Nakano, Y. Nozue, S. Sulaiman, M.I. Mohamed-Ibrahim, P.B. Kumar, and I. Watanabe
  • Organizer: Rare Earth Conferences 2016
  • Place of Presentation: Conference Hall, Hokkaido University
  • Year and Date: 2016-06-05
  • Int'l Joint Research
• [Presentation] Investigation of magnetic ordered states in the (Nd1-xCax)2Ir2O7 probed by μSR (2016)
  • Author(s): R. Asih, N. Adam, S. S. Mohd-Tajudin, S. Maeda, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: Hokkaido University-RIKEN symposium
  • Place of Presentation: Graduate School of Science, Hokkaido University, Sapporo
  • Year and Date: 2016-05-25
• [Presentation] Effect of Ca-substitution on the magnetic ordered state of (Na1-xCax)2Ir2O7 studied by μSR (2016)
  • Author(s): R. Asih, S. S. Mohd-Tajudin, S. Maeda, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, and Y. Nozue
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（仙台市）
  • Year and Date: 2016-03-21
• [Presentation] Quantum spin ice: current issues and beyond (2016)
  • Author(s): Shigeki Onoda
  • Organizer: 2016 Quantum Materials Symposium
  • Place of Presentation: Muui Island Homeplus Academy, Korea
  • Year and Date: 2016-02-22
  • Int'l Joint Research / Invited
• [Presentation] Magnetic Properties and Carrier Doping Effect in Pyrochlore Iridates Ln2Ir2O7 (2016)
  • Author(s): K. Matsuhira, S. Maeda, S. Yamamoto, R. Shibahara, A. Miyake, M. Tokunaga, M. Wakeshima, Y. Hinatsu
  • Organizer: Frontier of the Muon Science Applications
  • Place of Presentation: 理化学研究所（和光市）
  • Year and Date: 2016-02-16
  • Int'l Joint Research
• [Presentation] μSR Study on the Pyrochlore Iridates R2Ir2O7 (R= Nd,Sm) (2015)
  • Author(s): R. Asih, N. Adam, S. S. Mohd-Tajudin, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, Y. Nozue
  • Organizer: International Symposium on Present and Future of Material Sciences
  • Place of Presentation: 大阪大学（豊中市）
  • Year and Date: 2015-11-17
  • Int'l Joint Research
• [Presentation] μSR Study on the Pyrochlore Iridates R2Ir2O7 (R= Nd,Sm) (2015)
  • Author(s): R. Asih, N. Adam, S. S. Mohd-Tajudin, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, Y. Nozue
  • Organizer: 東大物性研短期研究会「スピン系物理の深化と最前線」
  • Place of Presentation: 東京大学物性研（千葉県柏市）
  • Year and Date: 2015-11-16
• [Presentation] μSRで磁性体中の微小スピンを見る (2015)
  • Author(s): 渡邊功雄
  • Organizer: 原研先端基礎研究センター・基礎科学セミナー
  • Place of Presentation: 原研先端基礎研究センター（茨城県東海村）
  • Year and Date: 2015-10-29
• [Presentation] Theory for electronic properties of oxide pyrochlores: quantum spin ice and iridates (2015)
  • Author(s): Shigeki Onoda
  • Organizer: TMU International Symposium on “New Quantum Phases Emerging from Novel Crystal Structure”
  • Place of Presentation: 首都大学東京（八王子市）
  • Year and Date: 2015-09-25
  • Int'l Joint Research / Invited
• [Presentation] パイロクロア型Ir酸化物における磁気秩序と電子状態の第一原理計算 (2015)
  • Author(s): 石井史之,水田耀ピエール, 加藤毅大, 尾崎泰助, Hongming Weng, 小野田繁樹
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（吹田市）
  • Year and Date: 2015-09-18
• [Presentation] Investigation of Magnetic Ordered State in the Pyrochlore Iridates R2Ir2O7 (R= Nd,Sm) probed by μSR (2015)
  • Author(s): R. Asih, N. Adam, S. S. Mohd-Tajudin, K. Matsuhira, M. Wakeshima, Y. Hinatsu, A. Miyake, M. Tokunaga, I. Watanabe, T. Nakano, Y. Nozue
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（吹田市）
  • Year and Date: 2015-09-18
• [Presentation] パイロクロア型イリジウム酸化物 Y2Ir2O7 における Ca 置換効果 (2015)
  • Author(s): 山本祥子,前田賢,於久晃大,分島亮,日夏幸雄, 三宅厚志,徳永将史,松平和之
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（吹田市）
  • Year and Date: 2015-09-17
• [Presentation] キャリアドープによるパイロクロア型イリジウム酸化物Nd2Ir2O7の量子臨界性の研究 (2015)
  • Author(s): 前田賢,後藤岳,坂本健,分島亮,日夏幸雄,三宅厚志,徳永将史,松平和之
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（吹田市）
  • Year and Date: 2015-09-17
• [Presentation] Thermal, transport, and spectral properties of generic quantum spin ice beyond the mean-field theory (2015)
  • Author(s): Shigeki Onoda
  • Organizer: The 20th International Conference on Magnetism (ICM2015)
  • Place of Presentation: Barcelona, Spain
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Presentation] μSR Studies of Spin Ground States in the Pyrochlore Iridate Nd2Ir2O7 (2015)
  • Author(s): 渡邊功雄、Hanjie Guo、松平和之、川崎郁斗、分島 亮、日夏 幸雄、Zhu-an Xu
  • Organizer: 4th Annual World Congress of Advanced Materials-2015 (WCAM2015)
  • Place of Presentation: 重慶市，中国
  • Year and Date: 2015-05-27
  • Int'l Joint Research / Invited