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MA: Fachverband Magnetismus
MA 2: Altermagnets I
MA 2.11: Vortrag
Montag, 9. März 2026, 12:15–12:30, HSZ/0004
Heisenberg models of altermagnets — •Volodymyr Kravchuk1,2, Kostiantyn Yershov1,2, and Jeroen van den Brink1 — 1Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany — 2Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine, 03143 Kyiv, Ukraine
Being collinear-compensated magnets, altermagnets differ from conventional antiferromagnets by a more complex symmetry transformation that connects two sublattices. Due to the specific local nonmagnetic surroundings of the magnetic atoms, the symmetry transformation also involves rotation or mirror reflection, in addition to translation and time reversal. Here we propose Heisenberg models for a number of materials, including d-wave (rutiles), bulk g-wave (CrSb, MnTe), and planar g-wave (FeS2) alternagnets. The models capture the altermagnetic properties due to the additional superexchange interactions whose bonds orientations respect the symmetry of the local nonmagnetic surrounding of the magnetic atoms. Using our models, we reproduce the altermagnetic splitting in the magnon spectra, and predict a number of new effects induced by altermagnetism, namely fluctuation-induced piezomagnetism and thermal spin conductivity for d-wave altermagnets, and emergent magnetization of domain walls for both d- and g-wave altermagnets. For planar g-wave altermagnets, we demonstrate that mechanical stress can induce the effective g-wave -- d-wave transition for low-energy magnons. As a result, the stress-induced thermal spin conductivity appears.
Keywords: Heisenbeg model; magnon spectra; g-wave altermagnet; d-wave altermagnet