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arXiv · 2101.05512

Planar Hall effect with sixfold oscillations in a Dirac antiperovskite

D. Huang·H. Nakamura·H. Takagi
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Abstract

The planar Hall effect (PHE), wherein a rotating magnetic field in the plane of a sample induces oscillating transverse voltage, has recently garnered attention in a wide range of topological metals and insulators. The observed twofold oscillations in $\rho_{yx}$ as the magnetic field completes one rotation are the result of chiral, orbital and/or spin effects. The antiperovskites $A_3B$O ($A$ = Ca, Sr, Ba; $B$ = Sn, Pb) are topological crystalline insulators whose low-energy excitations are described by a generalized Dirac equation for fermions with total angular momentum $J = 3/2$. We report unusual sixfold oscillations in the PHE of Sr$_3$SnO, which persisted nearly up to room temperature. Multiple harmonics (twofold, fourfold and sixfold), which exhibited distinct field and temperature dependencies, were detected in $\rho_{xx}$ and $\rho_{yx}$. These observations are more diverse than those in other Dirac and Weyl semimetals and point to a richer interplay of microscopic processes underlying the PHE in the antiperovskites.

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D. Huang, H. Nakamura, H. Takagi. 2021-01-14. Planar Hall effect with sixfold oscillations in a Dirac antiperovskite. https://doi.org/10.1103/physrevresearch.3.013268

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