Experimental Approach to the Mechanism of High-Tc Superconductivity

  • H. Katayama-Yoshida
  • T. Takahashi
  • Y. Okabe
Conference paper
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 11)

Abstract

One of the most fascinating problems in solid state physics is the mechanism of high-transition-temperature (high-Tc) superconductivity discovered in layered copper oxides. The knowledge of the electronic structure is a key step toward the theoretical understanding of the mechanism of high-Tc superconductivity. We determine the band structure of single crystal of Bi2Sr2CaCu2O8 system by angle-resolved resonant photoemission measurement with synchrotron radiation [1,2]. We give a direct evidence for the Fermi-liquid states with O-2p character at the Fermi level in section 2. The nuclear magnetic resonance (NMR) study is a powerful tool which allows us to differentiate the microscopic properties between the copper and oxygen sites in both normal and superconducting states. We performed NMR study of enriched-17O in Y-Ba-Cu-O system by the collaboration with Prof. K. Asayama’s group [presented in this symposium], and found BCS-like enhancement of the nuclear-spin-lattice relaxation rate (1/T1) just below Tc [3,4]. We present an evidence that the high-Tc superconductivity is of s-wave type with O-2p hole Cooper pairing, while the Cu-3d holes are nearly localized with antiferromagnetic spin-fluctuation in section 3. To clarify the high-Tc mechanism, we also report the oxygen isotope effect for Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O systems in section 4 [5,6].

Keywords

Nickel Coherence 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • H. Katayama-Yoshida
    • 1
  • T. Takahashi
    • 1
  • Y. Okabe
    • 1
  1. 1.Department of Physics, Faculty of ScienceTohoku UniversitySendai 980Japan

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