Analysis of Superconductivity in d-p Model on Basis of Perturbation Theory

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Author(s)

Abstract

We investigate the mass enhancement factor and the superconducting transition temperature in the d-p model for the high-T_c cuprates. We solve the Eliashberg equation using the third-order perturbation theory with respect to the on-site Coulomb repulsion U. We find that when the energy difference between the d-level and p-level is large, the mass enhancement factor becomes large and T_c tends to be suppressed owing to the difference of the density of state for d-electron at the Fermi level. From another viewpoint, when the energy difference is large, the d-hole number approaches unity and the electron correlation becomes strong and enhances the effective mass. This behavior for the electron number is the same as that for the f-electron number in the heavy fermion systems. The mass enhancement factor plays an essential role in understanding the difference in T_c between the LSCO and YBCO systems.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 74(5), 1397-1400, 2005-05

    The Physical Society of Japan (JPS)

Cited by:  2

Codes

  • NII Article ID (NAID)
    110001979544
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    7310589
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJPref  NDL  NII-ELS 
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