Investigation of magnetic isotope effect in high-Tc superconductors

2011 Fiscal Year Final Research Report

• Project/Area Number: 22740230
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: MATSUURA Masato 東北大学, 金属材料研究所, 助教 (30376652)
• Project Period (FY): 2010 – 2011
• Keywords: 高温超伝導

Research Abstract

In order to reveal microscopic mechanism of the formation of Cooper pairs in high transition temperature (T_c) superconducting cuprates, we have investigated Ni-doping effect on spin dynamics by inelastic neutrons scattering. We have found that the waist energy of the hourglass shaped dispersion, E_<cross>. shift to lower energies with holding linear relationship to T_c, which is analogous to the isotope effect in BCS-type superconductors. Our findings indicate that antiferromagnetic spin fluctuations near E_<cross> play an important role on the formation of Cooper pairs in high-T_c cuprates.

Research Products

• [Journal Article] Ni-substitution effects on the spin dynamics and superconductivity in La_<1.85>Sr_<0.15>CuO_4 (2012)
  • Author(s): M. Matsuura, M. Fujita, H. Hiraka, M. Kofu, H. Kimura, S. Wakimoto, T. G. Perring, C. D. Frost, and K. Yamada
  • Journal Title: Phys. Rev. B Volume: 86 Pages: 024706/1-7
  • URL: http://dx.doi.org/10.1103/PhysRevB.86.134529
  • Peer Reviewed
• [Journal Article] Neutron-Scattering Study of Fe-Substitution Effect on the Static Spin Correlation in La_<2-x>Sr_xNiO_4 (2011)
  • Author(s): T. Imasato, M. Fujita, M. Matsuura, M. Enoki, and K. Yamada
  • Journal Title: J. Phys. Soc. Jpn suppl Volume: 80 Pages: SB027/1-4
  • URL: http://jpsj.ipap.jp/link?JPSJS/80SB/SB027/pdf
  • Peer Reviewed
• [Journal Article] Progress in Neutron Scattering Studies of Spin Excitations in High-T_c Cuprates (2011)
  • Author(s): Masaki Fujita, Haruhiro Hiraka, Masaaki Matsuda, Masato Matsuura, John M. Tranquada, Shuichi Wakimoto, Guangyong Xu, and Kazuyoshi Yamada
  • Journal Title: J. Phys. Soc. Jpn Volume: 81 Pages: 011007/1-9
  • URL: http://dx.doi.org/10.1143/JPSJ.81.011007
  • Peer Reviewed
• [Presentation] アンダードープLa_<1.925>Sr_<0.075>CuO_4のT*を挟んだ磁気励起の温度変化 (2013)
  • Author(s): 川村奨,佐藤研太朗,松浦直人,藤田全基,梶本亮一,SungdaeJi,池内和彦,中村充孝,稲村泰弘,新井正敏,山田和芳
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学
  • Year and Date: 2013-03-27
• [Presentation] 不足ドープ領域La_<1.90>Sr_<0.10>CuO_4における磁気励起の温度変化II,日本物理学会 (2013)
  • Author(s): 佐藤研太朗,堤健二,松浦直人,藤田全基,梶本亮一,SundaeJi,池内和彦,中村充考,稲村泰弘,新井正敏,榎木勝徳,山田和芳
  • Organizer: 第68回年次大会
  • Place of Presentation: 広島大学
  • Year and Date: 2013-03-27
• [Presentation] High-energy magnetic excitations in underdoped La_<1.90>Sr_<0.10>CuO_4 (2012)
  • Author(s): Kentaro Sato, Masato Matsuura, Masaki Fujita, Ryoichi Kajimoto, Sungdae Ji, Kazuhiko Ikeuchi, Mitsutaka Nakamura, Yasuhiro Inamura, Masatoshi Arai, Masanori Enoki, and Kazuyoshi Yamada
  • Organizer: The 19th International Conference on Magnetism
  • Place of Presentation: Busan, Korea
  • Year and Date: 20120708-13
• [Presentation] 中性子非弾性散乱によるアンダードープLa_<1.90>Sr_<0.1>CuO_4の擬ギャップ相境界における磁気励起の変化 (2012)
  • Author(s): 佐藤研太朗,堤健二,松浦直人,藤田全基,梶本亮一,SundaeJi,池内和彦,中村充考,稲村泰弘,新井正敏,榎木勝徳,山田和芳
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-21
• [Presentation] わずかに過剰ドープされたLa_<1.82>Sr_<0.18>CuO_4に見られる磁気励起の二重構造 (2012)
  • Author(s): 藤田全基,榎木勝徳,堤健之,松浦直人,山田和芳,梶本亮一,稲村泰弘,中村充孝,新井正敏,J.M. Tranquada
  • Organizer: 日本物理学会 2012年秋季大会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-21
• [Presentation] La2-xSrxCuO4最適ドープ組成における高エネルギー磁気励起のNi置換効果 (2012)
  • Author(s): 松浦直人,佐藤研太郎,藤田全基,山田和芳
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-24
• [Presentation] La_<2-x>Sr_xCuO_4最適ドープ組成における磁気励起のNi置換効果 (2011)
  • Author(s): 松浦直人,藤田全基,山田和芳
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-22