Describing Sr2RuO4 superconductivity in a generalized Ginzburg--Landau theory

TL;DR

This paper introduces a generalized Ginzburg-Landau model to explain the unconventional thermodynamic and magnetic behaviors of Sr2RuO4, successfully predicting experimental phenomena such as heat capacity jumps and critical temperature behavior.

Contribution

It presents a two-phase superconductivity model based on a straightforward extension of Ginzburg-Landau theory, offering new insights into Sr2RuO4's properties.

Findings

Predicts two jumps in heat capacity

Models double curve in critical temperature vs. magnetic field

Aligns well with experimental data for Sr2RuO4

Abstract

We propose a simple explanation of unconventional thermodynamical and magnetic properties observed for Sr2RuO4. Actually, our two-phase model of superconductivity, based on a straight generalization of the Ginzburg-Landau theory, does predict two jumps in the heat capacity as well as a double curve for the dependence of the critical temperature on an external magnetic field. Such theoretical previsions well agree with the currently available experimental data for Sr2RuO4