Magnetoelastic coupling and effects of uniaxial strain in $\alpha$-RuCl$_3$ from first principles

TL;DR

This study uses first-principles calculations to explore how uniaxial strain affects magnetic interactions in $ ext{RuCl}_3$, revealing strain as a promising tool to tune its magnetic properties towards the Kitaev limit.

Contribution

The paper provides the first detailed first-principles analysis of magnetoelastic coupling in $ ext{RuCl}_3$, highlighting strain effects on magnetic interactions and proposing strain as a tuning mechanism.

Findings

Kitaev interaction is highly sensitive to strain.

Uniaxial strain can enhance Kitaev interactions.

Strain influences the relative strength of magnetic couplings.

Abstract

We present first-principles results on the magnetoelastic coupling in $\alpha$-RuCl$_3$ and uncover a striking dependence of the magnetic coupling constants on strain effects. Different magnetic interactions are found to respond very unequally to variations in the lattice, with the Kitaev interaction being the most sensitive. Exact diagonalization results on our magnetoelastic model reproduce recent measurements of the structural Gr\"uneisen parameter and explain the origin of the negative magnetostriction of $\alpha$-RuCl$_3$, disentangling contributions related to different anisotropic interactions and g factors. Uniaxial strain perpendicular to the honeycomb planes is predicted to reorganize the relative coupling strengths, strongly enhancing the Kitaev interaction while simultaneously weakening the other anisotropic exchanges under compression. Uniaxial strain may therefore pose a fruitful route to experimentally tune $\alpha$-RuCl$_3$ nearer to the Kitaev limit.