Abstract

We solve the Eliashberg equations exactly for anisotropic interactions projected onto extended s-wave and d-wave states. The resulting density of states for a gap with nodes (s- or d-wave) yields a nuclear spin relaxation rate which has almost no Hebel-Slichter peak. We calculate ΔF, Hc, and ΔC for different coupling constants and Einstein spectra of the isotropic and anisotropic interactions. The specific heat jump ΔC can be large and sharp compared to BCS theory. We conclude that gaps having nodes yield better agreement with experiments on high-Tc superconductors.

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