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MA: Fachverband Magnetismus

MA 21: Phd Focus Session: Altermagnets: Foundations and Experimental Evidence

MA 21.6: Talk

Wednesday, March 20, 2024, 11:15–11:30, H 1058

Spontaneous formation of altermagnetism from orbital ordering — •Johannes Knolle¹, Valentin Leeb¹, Alexander Mook², and Libor Smejkal² — ¹Technical University of Munich, TUM School of Natural Sciences, Physics Department, TQM, 85748 Garching, Germany — ²Institute of Physics, Johannes Gutenberg-University Mainz, Staudingerweg 7, Mainz 55128, Germany

Altermagnetism has emerged as a third type of collinear magnetism. In contrast to standard antiferromagnets, sublattices of anti-aligned spins are not connected by simple translations or inversion but require additional real-space rotations. Therefore, most proposals for materials realization concentrate on crystals that already have this low symmetry. Here, we show that altermagnetism can also form spontaneously as an interaction-induced electronic instability in a high symmetry crystal. We provide a microscopic example of a two orbital model showing that the coexistence of antiferromagnetic and orbital order realizes an altermagnetic phase. We quantify experimental observables like the spin conductivity and discuss possible material candidates with orbital ordering.