2000/10/05 by M. B. Walker, Walker, M. B.
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0010086
9 pages. The previous version of this article contained an incorrect proof and incorrect results (the previous Eqs. 26 and 27)
arxiv created 2000/10/31 · arxiv updated 2009/11/30
This article develops a Fermi-liquid theory for superconductors with anisotropic Fermi surfaces, Fermi-liquid interactions, and energy gaps. For d-wave superconductors, the Fermi-liquid interaction effects are found to be classifiable into strong and negligible renormalizaton effects, for symmetric and antisymmetric combinations of the energies of k\uparrow and -k\downarrow quasiparticles, respectively. Furthermore, the leading clean-limit temperature-dependent correction to the superfluid density in a d-wave superconductor is found to be renormalized by a Fermi velocity (or mass) renormalization effect. The question is raised of whether or not the penetration depth in the high temperature superconductor YBa2Cu3O6+xa can be accounted for with physically acceptable parameters within the framework of a quasiparticle model. Fermi-liquid corrections to the spin susceptibility and to the zero-energy magnetic-field-induced density of states are also evaluated.