Low temperature electronic properties of Sr_2RuO_4 III: Magnetic fields

TL;DR

This paper models the low-temperature electronic properties of Sr_2RuO_4 under magnetic fields, explaining experimental data on specific heat and susceptibility within a phenomenological framework.

Contribution

It introduces a comprehensive phenomenological model that accounts for magnetic field effects on superconducting properties of Sr_2RuO_4, including critical fields and anisotropy.

Findings

Consistent description of specific heat and ac-susceptibility data

Analysis of upper critical fields and their directional dependence

Insights into order parameter anisotropy and fluctuation fields

Abstract

Based on the microscopic model introduced previously the observed specific heat and ac-susceptibility data in the superconducting phase in Sr_2RuO_4 with applied magnetic fields are described consistently within a phenomenological approach. Discussed in detail are the temperature dependence of the upper critical fields H_{c2} and H_2, the dependence of the upper critical fields on the field direction, the linear specific heat below the superconducting phase transition as a function of field or temperature, the anisotropy of the two spatial components of the order parameter, and the fluctuation field H_p.