Role of apical oxygen atoms in the electronic structure and pair formation in high-Tc superconductors

2009 Fiscal Year Final Research Report

• Project/Area Number: 19340093
• 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: The University of Tokyo
• Principal Investigator: UCHIDA Shin-ichi The University of Tokyo, 大学院・理学系研究科, 教授 (10114399)
• Project Period (FY): 2007 – 2009
• Keywords: 高温超伝導

Research Abstract

A role played by the apical oxygen atoms in the high-Tc copper oxide superconductors is elucidated. It is found that the distance of the apical oxygen atoms from the CuO_2 plane and disorder around apical oxygen sites are very influential for Tc. Based on this result we have succeeded in enhancing Tc in a few copper oxide superconductors.

Research Products

• [Journal Article] Out-of-plane effect on the superconductivity of Sr_<2-x>Ba_xCuO_<3+δ> with Tc up to 98K (2009)
  • Author(s): W. B. Gao, Q. Q. Liu, L. X. Yang, Y. Yu, F. Y. Li, C. Q. Jin, S. Uchida
  • Journal Title: Phys.Rev.B 80 Pages: 094523
  • Peer Reviewed
• [Journal Article] Spectroscopie Fingerprint of Phase-Incoherent Superconductivity in the Underdoped Bi_2Sr_2CaCu_2O_<8+δ> (2009)
  • Author(s): Jhinhwan Lee, K. Fujita, A. R. Schmidt, Chung Koo Kim, H. Eisaki, S. Uchida, J. C. Davis
  • Journal Title: Science 325 Pages: 1099-1103
  • Peer Reviewed
• [Journal Article] Effects of out-of-plane disorder on the nodal quasiparticle and superconducting gap in single-layer Bi_2Sr_<1.6>L_<0.4>CuO_<6+δ> (L=La, Nd, Gd) (2009)
  • Author(s): M. Hashimoto, T. Yoshida, A. Fujimori, D. H. Lu, Z.-X. Shen, M. Kubota, K. Ono, M. Ishikado, K. Fujita, S. Uchida
  • Journal Title: Phys.Rev.B 79 Pages: 144517(R)
  • Peer Reviewed
• [Journal Article] Enhancement of the superconducting critical temperature in Bi_2Sr_2CaCu_2O_<8+δ> by controlling disorder outside CuO_2 planes (2009)
  • Author(s): H. Hobou, S. Ishida, K. Fujita, M. Ishikado, K. M. Kojima, H. Eisaki, S. Uchida
  • Journal Title: Phys.Rev.B 79 Pages: 064507
  • Peer Reviewed
• [Journal Article] An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates (2008)
  • Author(s): H. Iwa-sawa, J. F. Douglas, K. Sato, T. Masui, Y. Yoshida, Z. Sun, H. Eisaki, H. Bando, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Tajima, S. Uchida, T. Saitoh, D. S. Dessau, Y. Aiura
  • Journal Title: Phys.Rev.Lett. 101 Pages: 157005
  • Peer Reviewed
• [Journal Article] Imaging the impact on cuprate superconductivity of varying the interatomic distances within individual crystal unit cells (2008)
  • Author(s): J. A. Slezak, Jinho Lee, M. Wang, K. McElroy, K. Fujita, B. M. Andersen, P. J. Hirschfeld, H. Eisaki, S. Uchida, J. C. Davis
  • Journal Title: Proc.Nat.Acad.Science 105 Pages: 3203-3208
  • Peer Reviewed
• [Journal Article] The superconductivity up to 95 K by tuning order state in Sr_2CuO_<3+δ> (2007)
  • Author(s): Q. Q. Liu, H. Yang, Y. Yu, L. X. Yang, R. C. Yu, F. Y. Li, C. Q. Jin, S. Uchida
  • Journal Title: Physica C Pages: 463-465, 100-102
  • Peer Reviewed
• [Journal Article] A re-examination of the oxygen isotope effect in ARPES spectra of Bi2212 (2007)
  • Author(s): H. Iwasawa, Y. Aiura, T. Saitoh, H. Eisaki, H. Bando, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, T. Masui, S. Tajima, M. Ishikado, K. Fujita, S. Uchida, J. F. Douglas, Z. Sun, D. S. Dessau
  • Journal Title: Physica C Pages: 463-465, 52-55
  • Peer Reviewed
• [Journal Article] Correlation of superconductivity with the ordering state at the apical oxygen layer in the Sr_2CuO_<3+δ> superconductor (2007)
  • Author(s): Q. Q. Liu, H. Yang, X. M. Qin, L. X. Yang F. Y. Li, Y. Yu, R. C. Yu, C. Q. Jin, S. Uchida
  • Journal Title: Physica C Pages: 460-462, 56-57
  • Peer Reviewed
• [Presentation] High-Tc Cuprates : Overview (2009)
  • Author(s): S. Uchida
  • Organizer: G-COE Workshop
  • Place of Presentation: Tokyo
  • Year and Date: 2009-01-10
• [Presentation] Common Ingredients for High Tc between Cuprates and Fe-Pnictides (2008)
  • Author(s): S. Uchida
  • Organizer: Japan-China- Korea A3 Foresight Meeting
  • Place of Presentation: Shanghai, China
  • Year and Date: 2008-12-08
• [Presentation] Role of Apical Oxygen Atoms in High- Tc Superconductivity (2008)
  • Author(s): S. Uchida
  • Organizer: The 6th International Con- ference, Stripe 2008, "Quantum Phenomena in Complex Matter"
  • Place of Presentation: Erice, Italy
  • Year and Date: 2008-07-27
• [Presentation] Introduction and Road to Room Temperature Superconductivity (2008)
  • Author(s): S. Uchida
  • Organizer: JST International Symposium on Fe-oxipnictide superconductors
  • Place of Presentation: Tokyo
  • Year and Date: 2008-06-29
• [Presentation] Road to Higher Tc (2007)
  • Author(s): S. Uchida
  • Organizer: The 20th International Symposium on Superconductivity
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2007-11-05
• [Presentation] How to increase superconducting Tc? (2007)
  • Author(s): S. Uchida
  • Organizer: The 5th 21st Century COE Symposium on Physics of Self-Organization System
  • Place of Presentation: Waseda, Japan
  • Year and Date: 2007-09-13
• [Presentation] Intra-Multilayer Josephson Plasma Mode in HgBa_2Ca_<n-1>Cu_nO2_<n+2+δ> (2007)
  • Author(s): S. Uchida
  • Organizer: International Conference on Spectroscopies in Novel Superconductors
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2007-08-23
• [Presentation] How to Enhance Tc of cuprate Super- conductors? (2007)
  • Author(s): S. Uchida
  • Organizer: Workshop on the Road to Room Temperature Superconductivity
  • Place of Presentation: Loen, Norway
  • Year and Date: 2007-06-20
• [Presentation] How to increase Tc in cuprates? (2007)
  • Author(s): S. Uchida
  • Organizer: The 6th Asia-Pacific Workshop on Frontiers of Condenced-Matter Science and Symposium on 20 years Anniversary of Discovery of YBCO
  • Place of Presentation: Taipei, Taiwan
  • Year and Date: 2007-04-14
• [Remarks] ホームページ等
  • URL: http://lyra.t.u-tokyo.ac.jp/