Absence of local moments in the kagome metal KV3Sb5 as determined by muon spin spectroscopy

TL;DR

This study uses muon spin spectroscopy to investigate KV3Sb5, revealing no local magnetic moments on vanadium atoms and suggesting nuclear moments dominate the local fields, impacting understanding of its anomalous Hall effect.

Contribution

The paper provides the first muon spin spectroscopy analysis of KV3Sb5, showing absence of V4+ local moments and highlighting nuclear moments' role in its magnetic properties.

Findings

No evidence of V4+ local moments

Local fields dominated by nuclear moments

Weak magnetic disorder with temperature dependence

Abstract

We have carried out muon spin relaxation and rotation measurements on the newly discovered kagome metal KV3Sb5, and find a local field dominated by weak magnetic disorder which we associate with the nuclear moments present, and a modest temperature dependence which tracks the bulk magnetic susceptibility. We find no evidence for the existence of V4+ local moments, suggesting that the physics underlying the recently reported giant unconventional anomalous Hall effect in this material warrants further studies.