$T_c$ and Pauli limited critical field of $\text{Sr}_2\text{Ru}\text{O}_4$: uniaxial strain dependence

TL;DR

This study investigates how uniaxial strain affects the critical temperature and critical field of Sr2RuO4, comparing theoretical models with experiments to identify the most likely pairing symmetry and emphasizing the role of its multi-band structure.

Contribution

The paper compares strain dependence of $T_c$ and $H_{c2}$ across different pairing channels using a three-band model, helping to narrow down the pairing symmetry in Sr2RuO4.

Findings

Strain dependence varies among pairing channels.

Multi-band effects are crucial for accurate modeling.

Results favor certain pairing symmetries over others.

Abstract

Variations of critical temperature $T_c$ and in-plane critical field $H_{c2}$ of $\text{Sr}_2\text{Ru}\text{O}_4$ under uniaxial stress have recently been reported. We compare the strain dependence of $T_c$ and $H_{c2}$ in various pairing channels ($d$-wave, extended s-wave and $p$-wave) with the experimental observations, by studying a three-band tight-binding model that includes effects of spin-orbit and Zeeman couplings and a separable pairing interaction. Our study helps narrow down the possibility of pairing channels. The importance of the multi-band nature of $\text{Sr}_2\text{Ru}\text{O}_4$ is also highlighted.