Chiral anomaly in the Weyl semimetal TaRhTe$_4$

TL;DR

This study investigates the negative longitudinal magnetoresistance in TaRhTe4, a type-II Weyl semimetal, confirming the chiral anomaly as its origin and demonstrating its persistence up to room temperature.

Contribution

The paper provides systematic experimental evidence linking negative magnetoresistance in TaRhTe4 to the chiral anomaly, excluding other effects and highlighting its unique properties among Weyl semimetals.

Findings

Negative magnetoresistance occurs only when magnetic field is parallel to electric field.

The origin of negative magnetoresistance is consistent with the chiral anomaly.

Negative magnetoresistance persists up to room temperature.

Abstract

TaRhTe$_4$ is a type-IIWeyl semimetal, exhibiting fourWeyl points in proximity to the Fermi level. In this article, we report our results of a systematic study of longitudinal magnetoresistance in TaRhTe$_4$. Our findings indicate that magnetoresistance becomes negative only when the magnetic field is applied parallel to the electric field. By rotating E (as well as B), we show that its origin is consistent with the prediction of the chiral anomaly, while the current jetting effect and weak localization could be excluded. The negative magnetoresistance persists up to room temperature, suggesting that TaRhTe4 exhibits distinctive properties within the family of Weyl semimetals.