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

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

2005-01-21

arxiv.org/abs/cond-mat/0501511v3

Physics

Condensed Matter

Superconductivity

4pages, 9figures, to be published in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.74.1397

We investigate the mass enhancement factor and the superconducting transition temperature in the d-p model for the high-$\Tc$ 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 d-level and p-level is large, the mass enhancement factor becomes large and $\Tc$ tends to be suppressed owing to the difference of the density of state for d-electron at the Fermi level. From another view point, when the energy difference is large, the d-hole number approaches to unity and the electron correlation becomes strong and enhances the effective mass. This behavior for the electron number is the same as that of the f-electron number in the heavy fermion systems. The mass enhancement factor plays an essential role in understanding the difference of $\Tc$ between the LSCO and YBCO systems.

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