Tuning of altermagnetism by strain

ORAL

Abstract

For all collinear altermagnets, we sort out piezomagnetic free-energy invariants allowed in the nonrelativistic limit and relativistic piezomagnetic invariants bilinear in the Neel vector L and magnetization M, which include strain-induced Dzyaloshinskii-Moriya interaction. In the nonrelativistic limit, I present two distinct mechanisms of piezomagnetism: 1) the band-filling mechanism, which exists in metals and 2) the temperature-dependent exchange-driven mechanism typical for insulators. The two mechanisms are illustrated by analytical results for Lieb lattice model and by numerical calculations for CrSb. I show how the triplet Cooper pairs supported by inversion symmetry become non-unitatry under the action of pizomagnetically active strain.

*Israel Science Foundation, Grant No. 2665/20. The Army Research Office under Cooperative Agreement Number W911NF-22-2-0173. The U.S. Department of Energy (DOE) Established Program to Stimulate Competitive Research (EP-SCoR) through Grant No. DE-SC0024284. The startup fund from the University of South Carolina. The Holland Computing Center of the University of Nebraska, which receives support from the UNL Office of Research and Economic Development and from the Nebraska Research Initiative. The Expanse supercomputer at the San Diego Supercomputer Center through allocation PHY230093 from the Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS) program, which is supported by National Science Foundation Grants No. 2138259, No. 2138286, No. 2138307, No. 2137603, and No. 2138296.

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Publication: https://arxiv.org/abs/2506.06257

Presenters

  • Maxim Khodas

    • Hebrew University of Jerusalem

Authors

  • Maxim Khodas

    • Hebrew University of Jerusalem

  • Sai Mu

    • University of South Carolina

  • Igor I Mazin

    • George Mason University

  • Kirill Belashchenko

    • University of Nebraska-Lincoln