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.
| Original language | English |
|---|---|
| Article number | L061201 |
| Journal | Physical Review Materials |
| Volume | 9 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2025 |
Funding
This work was primarily supported by the Department of Defense, Air Force Office of Scientific Research, under Grant No. FA9550-21-1-0343. S.L. and E.M. acknowledge partial support from Robert A. Welch Foundation Grant No. C-2114. K.T.L. acknowledges the support of HKRGC through Grants No. RFS2021-6S03, No. C6025-19G, No. AoE/P-701/20, No. 16307622, No. 16310520, and No. 16310219. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The work of E.M.C. (neutron scattering data collection and analysis) was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division.