p-wave and d-wave superconductivity in quasi-two-dimensional metals

TL;DR

This paper compares the superconducting pairing mechanisms in nearly antiferromagnetic and ferromagnetic quasi-two-dimensional metals, highlighting the dominance of d-wave pairing in antiferromagnetic cases and discussing implications for layered materials like Sr2RuO4.

Contribution

It provides a detailed mean-field analysis of magnetic fluctuation-mediated pairing, including full momentum dependence, and compares d-wave and p-wave pairing strengths in different magnetic regimes.

Findings

D-wave singlet pairing is stronger in nearly antiferromagnetic metals.

P-wave triplet pairing is weaker in nearly ferromagnetic metals.

Results are relevant for layered superconductors like Sr2RuO4.

Abstract

We compare predictions of the mean-field theory of superconductivity for nearly antiferromagnetic and nearly ferromagnetic metals in two dimensions. The calculations are based on a parametrization of the effective interaction arising from the exchange of magnetic fluctuations. The Eliashberg equations for the transition temperature are solved including the full momentum dependence of the self-energy. The results show that for comparable parameters d-wave singlet pairing in nearly antiferromagnetic metals is generally much stronger than p-wave triplet pairing in nearly ferromagnetic metals in quasi two dimensions. The relevance to the layered materials, and in particular Sr2RuO4 that exhibits p-wave triplet pairing, is discussed.