Anomalous Hall effect emerging from field-induced Weyl nodes in SmAlSi

Yuxiang Gao; Shiming Lei; Eleanor M. Clements; Yichen Zhang; Xue-Jian Gao; Songxue Chi; Kam Tuen Law; Ming Yi; Jeffrey W. Lynn; Emilia Morosan

doi:10.1103/PhysRevMaterials.9.L061201

Letter

Anomalous Hall effect emerging from field-induced Weyl nodes in SmAlSi

Yuxiang Gao ^1,2, Shiming Lei ^1,2,*, Eleanor M. Clements^3,4, Yichen Zhang^1,2, Xue-Jian Gao⁵, Songxue Chi ⁶, Kam Tuen Law⁵, Ming Yi^1,2, Jeffrey W. Lynn ³ et al.

Emilia Morosan ^1,2,†

¹Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
²Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA
³NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁴Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁵Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
⁶Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

^*Present address: Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
^†Contact author: emorosan@rice.edu

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Phys. Rev. Materials 9, L061201 – Published 4 June, 2025

DOI: https://doi.org/10.1103/PhysRevMaterials.9.L061201

Abstract

The intrinsic anomalous Hall effect (AHE) has been reported in numerous ferromagnetic Weyl semimetals. However, the AHE in the antiferromagnetic (AFM) or paramagnetic (PM) state of Weyl semimetals has rarely been observed experimentally. Different mechanisms have been proposed to account for the emergence of the AHE from different types of magnetic order. In this Letter, we propose a new model that explains the observed AHE in both the AFM and PM states of the noncentrosymmetric Weyl semimetal SmAlSi. The newly proposed mechanism is based on magnetic-field-induced Weyl node evolution, which qualitatively explains the temperature dependence of the anomalous Hall conductivity, which displays unconventional power-law behavior in both the AFM and PM states of SmAlSi.

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Anomalous Hall effect emerging from field-induced Weyl nodes in SmAlSi

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