Magneto-Transport Properties of Kagome Magnet TmMn$_6$Sn$_6$

TL;DR

This study investigates the complex transport phenomena in the kagome magnet TmMn$_6$Sn$_6$, revealing a prominent topological Hall effect, magnetic transitions, and anisotropic magnetoresistance linked to nontrivial magnetic states.

Contribution

It provides the first systematic analysis of transport properties in TmMn$_6$Sn$_6$, highlighting the interplay between magnetic states and topological effects in kagome magnets.

Findings

Observation of a wide-range topological Hall effect.

Identification of magnetic transition separating different magnetic states.

Extension of empirical models to understand planar magnetoresistivity.

Abstract

Kagome magnet usually hosts nontrivial electronic or magnetic states drawing great interests in condensed matter physics. In this paper, we report a systematic study on transport properties of kagome magnet TmMn$_6$Sn$_6$. The prominent topological Hall effect (THE) has been observed in a wide temperature region spanning over several magnetic phases and exhibits strong temperature and field dependence. This novel phenomenon due to non-zero spin chirality indicates possible appearance of nontrival magnetic states accompanying with strong fluctuations. The planar applied field drives planar Hall effect(PHE) and anistropic magnetoresisitivity(PAMR) exhibiting sharp disconnections in angular dependent planar resistivity violating the empirical law. By using an effective field, we identify a magnetic transition separating the PAMR into two groups belonging to various magnetic states. We extended the empirical formula to scale the field and temperature dependent planar magnetoresistivity and provide the understandings for planar transport behaviors with the crossover between various magnetic states. Our results shed lights on the novel transport effects in presence of multiple nontrivial magnetic states for the kagome lattice with complicated magnetic structures.