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MA: Fachverband Magnetismus

MA 52: Altermagnets

MA 52.9: Vortrag

Freitag, 22. März 2024, 11:45–12:00, EB 202

Mechanisms for stabilizing altermagnetism in minimal models — Mercè Roig¹, •Andreas Kreisel¹, Brian M. Andersen¹, Yue Yu², and Daniel F. Agterberg² — ¹Niels Bohr Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark — ²Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA

Altermagnetism has been proposed as a new magnetic phase that shares properties of antiferromagnets and ferromagnets like no net magnetization but finite anomalous Hall effect. In this work, we use minimal models to study the 2D and 3D mechanisms giving rise to altermagnetism by examining the altermagnetic susceptibility and comparing it to the usual spin susceptibility. In particular, in the 2D case we study the interplay between interband and intraband susceptibility and the effect of Van Hove singularities to stabilize altermagnetism. Finally, we discuss relevant tight-binding models for altermagnetic materials candidates, including the rutile metal RuO₂. We demonstrate that the minimal tight-binding models are sufficient to capture a leading altermagnetic instability.

Keywords: Altermagnetism; microscopic theory of magnetism; materials: RuO2, FeSb2, kappa-Cl