Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe

TL;DR

This paper theoretically investigates how non-local $d_{xy}$ nematicity influences magnetic anisotropy in FeSe, highlighting its importance in matching experimental temperature dependence and distinguishing nematic scenarios.

Contribution

It introduces the role of non-local $xy$ nematic order in explaining magnetic anisotropy in FeSe, expanding beyond traditional $xz/yz$ nematic models.

Findings

Non-local $xy$ nematicity significantly affects magnetic anisotropy.

The model reproduces the temperature dependence observed experimentally.

Different nematic scenarios leave distinct magnetic fingerprints.

Abstract

We analyze theoretically the magnetic anisotropy in the nematic phase of FeSe by computing the spin and the orbital susceptibilities from the microscopic multiorbital model. In particular, we take into account both the $xz/yz$ and the recently proposed non-local $xy$ nematic ordering and show that the latter one could play a crucial role in reproducing the experimentally-measured temperature dependence of the magnetic anisotropy. This provides a direct fingerprint of the different nematic scenarios on the magnetic properties of FeSe.