Synthesis of high-Tc superconducting crystal and study of spin and lattice dynamics by neutron scattering techniques

2010 Fiscal Year Final Research Report

• Project/Area Number: 20540342
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: FUJITA Masaki 東北大学, 金属材料研究所, 准教授 (20303894)
• Project Period (FY): 2008 – 2010
• Keywords: 磁性 / 超伝導 / 中性子散乱 / 単結晶育成

Research Abstract

High transition temperature superconductivity is one of the most attractive issues in the solid-state physics. In the preset study, spin and lattice dynamics were investigated by means of neutron-scattering techniques with the aim of elucidation of high-Tc mechanism. From the results obtained for various superconductors, it was revealed that two types of spin fluctuation exist in the superconducting system. Therefore, to understand the role of spin fluctuations for the high-Tc superconductivity, it is important to extract the universal feature from an entire spin fluctuation spectrum showing a multiple structure.

Research Products

• [Journal Article] Doping dependence of the (π, π)shadow band in La-based cuprates studied by angle-resolved photoemission spectroscopy (2011)
  • Author(s): R-H He, X J Zhou, M Hashimoto, T Yoshida, K Tanaka, S-K Mo, T Sasagawa, N Mannella, W Meevasana, H Yao, M Fujita, T Adachi, S Komiya, S Uchida, Y Ando, F Zhou, Z X Zhao, A Fujimori, Y Koike, K Yamada, Z Hussain, Z-X Shen
  • Journal Title: New J. Phys Volume: 13
  • Peer Reviewed
• [Journal Article] Investigation of the spin-glass regime between the antiferromagnetic and superconducting phases in Fe_<1+ y> Se_xTe_<1-x> (2011)
  • Author(s): N. Katayama, S. Ji, D. Louca, S.-H. Lee, M. Fujita, T. J. Sato, J. S. Wen, Z. J. Xu, G. D. Gu, G. Xu, Z. W. Lin, M. Enoki, S. Chang, K. Yamada and J. M. Tranquada
  • Journal Title: Phys. Soc. Jpn Volume: 79 Pages: 113702/1-113702/4
  • Peer Reviewed
• [Journal Article] Zero-doping state and electron. hole asymmetry in an ambipolar cuprate (2010)
  • Author(s): K. Segawa, M. Kofu, S-H. Lee, I. Tsukada, H. Hiraka, M. Fujita, S. Chang, K. Yamada and Y. Ando
  • Journal Title: Nature Physics Volume: 6 Pages: 579-583
  • Peer Reviewed
• [Journal Article] Coupling of spin and orbital excitations in the iron-based superconductor FeSe_<0. 5> Te_<0. 5> (2010)
  • Author(s): S.-H. Lee, Guangyong Xu, W. Ku, J. S. Wen, C. C. Lee, N. Katayama, Z. J. Xu, S. Ji, Z. W. Lin, G. D. Gu, H.-B. Yang, P. D. Johnson, Z.-H. Pan, T. Valla, M. Fujita, T. J. Sato, S. Chang, K. Yamada, and J. M. Tranquada
  • Journal Title: Phys. Rev. B Volume: 81 Pages: 220502
  • Peer Reviewed
• [Journal Article] Antiferromagnetic fluctuations in Fe(Se_<1-x> Te_x)_<0. 92> (x=0. 75, 1)observed by inelastic neutron scattering (2009)
  • Author(s): S. Iikubo, M. Fujita, S. Niitaka, and H. Takagi
  • Journal Title: J. Phys. Soc. Jpn. Volume: 78 Pages: 103704/1-103704/4
  • Peer Reviewed
• [Journal Article] Charge Excitations in the Stripe-Ordered La_<5/3> Sr_<1/3> NiO_4 and La_<2-x>(Ba, Sr)_xCuO_4 Superconducting Compounds (2009)
  • Author(s): S. Wakimoto, H. Kimura, K. Ishii, K. Ikeuchi, T. Adachi, M. Fujita, K. Kakurai, Y. Koike, J. Mizuki, Y. Noda, K. Yamada. A. H. Said, Yu. Shvyd' ko
  • Journal Title: Phys. Rev. Lett Volume: 102 Pages: 157001/1-157001/4
  • Peer Reviewed
• [Journal Article] Enhancement of Electronic Anomalies in Iron-Substituted La_<2-x> Sr_xCu_<1-y> Fe_yO_4 (2009)
  • Author(s): Tadashi Adachi, Hidetaka Sato, Masaki Fujita, Kazuyoshi Yamada, Yoji Koike
  • Journal Title: J. Phys. Soc. Jpn Volume: 78 Pages: 025002/1-025002/2
  • Peer Reviewed
• [Journal Article] Energy gap in the failed high-Tc superconductor La_<1. 875> Ba_<0. 125> CuO_4 (2009)
  • Author(s): Rui-Hua He, Kiyohisa Tanaka, Sung-Kwan Mo, Takao Sasagawa, Masaki Fujita, Tadashi Adachi, Norman Mannella, Kazuyoshi Yamada, Yoji Koike, Zahid Hussain, Zhi-Xun Shen
  • Journal Title: Nature Phys Volume: 5 Pages: 119-123
  • Peer Reviewed
• [Journal Article] Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-Temperature La_<2-x> Sr_xCuO_4 Superconductors (2009)
  • Author(s): M. Kofu, S.-H. Lee, M. Fujita, H.-J. Kang. H. Eisaki, K. Yamada
  • Journal Title: Phys. Rev. Lett Volume: 102 Pages: 047001/1-047001/4
  • Peer Reviewed
• [Presentation] Spin excitations in the electron-doped cuprate (2011)
  • Author(s): M. Fujita
  • Organizer: The International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011
  • Place of Presentation: Tokai, Ibaraki
  • Year and Date: 2011-02-24
• [Presentation] Neutron scattering study of novel spin excitations in high-Tc cuprate (2010)
  • Author(s): M. Fujita
  • Organizer: 9th Asia Pacific Workshop on Materials Physics
  • Place of Presentation: Hanoi, Vietnam
  • Year and Date: 2010-12-14
• [Presentation] Fe置換効果を通してみたLSCOの不足・過剰ドープ組成における磁気揺らぎの特徴 (2010)
  • Author(s): 藤田全基、榎木勝徳、飯久保智、山田和芳
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-26
• [Presentation] J-PARCチョッパー型分光器によるLa_<1. 5> Sr_<0. 5> NiO_4の磁気励起の観測 (2010)
  • Author(s): 藤田全基、中島健次, 梶本亮一, 新井正敏, 稲村泰弘, 河村聖子, 中村充孝、今里拓朗、山田和芳、脇本秀一
  • Organizer: 日本物理学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-23
• [Presentation] 高輝度中性子ビームの活用による高温超伝導体のスピンダイナミクス研究の新展開 (2010)
  • Author(s): 藤田全基
  • Organizer: 日本物理学会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-22
• [Presentation] LSCOの不足・過剰ドープ組成の静的磁気相関に対するFe置換効果 (2009)
  • Author(s): 藤田全基, 榎木勝徳, 飯久保智, 山田和芳
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] パルス中性子散乱によるBi2201超伝導体の高エネルギー磁気励起の研究 (2009)
  • Author(s): 藤田全基, 榎木勝徳, 飯久保智, 山田和芳, C. D. Frost
  • Organizer: 日本物理学会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] Incommensurate spin correlations in single-layered high-Tc cuprates La_<2-x> Sr_xCuO4 and (Bi, Pb)_<2+ x>(Sr, La)_<2-x> CuO_<6+ □> (2009)
  • Author(s): M. Fujita
  • Organizer: International workshop on physics of transition metal based superconductors
  • Place of Presentation: Sendai
  • Year and Date: 2009-06-26
• [Presentation] Incommensurate spin correlations in single-layered high-Tc cuprates La_<2-x> Sr_xCuO_4 and (Bi, Pb)_<2+ x>(Sr, La)_<2-x> CuO_<6+ δ> (2009)
  • Author(s): M. Fujita
  • Organizer: Workshop on physics of transition metal based superconductors
  • Place of Presentation: 東北大学
  • Year and Date: 2009-06-09
• [Presentation] Static Spin Correlation hidden behind the superconductivity in La_<2-x> Sr_xCuO_4 (2009)
  • Author(s): M. Fujtia, M. Enoki, S. Iikubo, K. Yamada
  • Organizer: Gordon conference
  • Place of Presentation: Kong Kong
  • Year and Date: 2009-06-09
• [Presentation] 新規鉄系超伝導体Fe(Se_<1-x> Te_x)_yの中性子散乱 (2009)
  • Author(s): 飯久保智, 藤田全基, 新高誠司, 高木英典
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-30
• [Presentation] 圧力下中性子散乱によるFeTe_<0. 92> の構造相転移と磁気秩序の研究 (2009)
  • Author(s): 藤田全基, 飯久保智, 松田雅昌, 長壁豊隆, 山内宏樹, 新高誠司, 高木英典
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-30
• [Presentation] Neutron-scattering studies on frustrated spin systems (2008)
  • Author(s): M. Fujita
  • Organizer: Institute of Materials Structure Science Symposium ' 08
  • Place of Presentation: Tsukuba
  • Year and Date: 2008-10-17
• [Presentation] 中性子散乱によるBi2201の超伝導相における磁気相関の研究 (2008)
  • Author(s): 榎木勝徳, 藤田全基, 山田和芳
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-20
• [Presentation] La_<2-x> Sr_xCuO_4の広い組成領域における磁気相関に対するFe置換効果の研究 (2008)
  • Author(s): 藤田全基, 榎木勝徳, 飯久保智, 山田和芳
  • Organizer: 日本物理学会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-20
• [Presentation] Neutron-scattering study of impurity effect on stripe correlation in La-based 214 high-Tc cuprate (2008)
  • Author(s): M. Fujita, M. Enoki, M. Matsuda, K. Kudo, T. Nishizaki, N. Kobayashi, K. Yamada
  • Organizer: The International Conference on Quantum Phenomena in Complex Matter of the series on Stripes and High-TC Superconductivity
  • Place of Presentation: Erice, Italy
  • Year and Date: 2008-07-29
• [Book] 動き出したJ-PARC中性子非弾性散乱装置「四季」. 中性子非弾性散乱実験の新規手法の実証 (2010)
  • Author(s): 梶本亮一, 中村充孝, 稲村泰弘, 水野文夫, 横尾哲也, 中谷健, 新井正敏, 藤田全基
  • Total Pages: 79-89
  • Publisher: アグネ出版センター
• [Book] 中性子散乱分光による磁性体研究の現状と将来, 固体物理 (2009)
  • Author(s): 山田和芳, 富安啓輔, 藤田全基
  • Total Pages: 777-785
  • Publisher: アグネ出版センター
• [Remarks]
  • URL: http://www.yamada-lab.imr.tohoku.ac.jp/jp/index.html