Ginzburg-Landau Expansion in Non-Fermi Liquid Superconductors: Effect of the Mass Renormalization Factor

TL;DR

This paper analytically explores the Ginzburg-Landau theory for non-Fermi liquid superconductors, revealing how mass renormalization influences key superconducting properties in different theoretical limits.

Contribution

It provides new analytical expressions for superconducting parameters in non-Fermi liquids, incorporating mass renormalization effects in specific theoretical regimes.

Findings

Derived coherence length, penetration depth, and critical field dependencies with mass renormalization.

Results reduce to BCS theory in certain limits.

Quantitative differences for d-wave symmetry are minimal, mainly numerical.

Abstract

We reconsider the Ginzburg-Landau expansion for the case of a non-Fermi liquid superconductor. We obtain analytical results for the Ginzburg-Landau functional in the critical region around the superconducting phase transition, T <= T_c, in two special limits of the model, i.e., the spin-charge separation case and the anomalous Fermi liquid case. For both cases, in the presence of a mass renormalization factor, we derived the form and the specific dependence of the coherence length, penetration depth, specific heat jump at the critical point, and the magnetic upper critical field. For both limits the obtained results reduce to the usual BCS results for a two dimensional s-wave superconductor. We compare our results with recent and relevant theoretical work. The results for a d--wave symmetry order parameter do not change qualitatively the results presented in this paper. Only numerical factors appear additionally in our expressions.