Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Phd Focus Session: Altermagnets: Foundations and Experimental Evidence
MA 21.5: Vortrag
Mittwoch, 20. März 2024, 11:00–11:15, H 1058
Supercell Altermagnets — •Rodrigo Jaeschke-Ubiergo1, Venkata Krishna Bharadwaj1, Tomáš Jungwirth2, Libor Šmejkal1, and Jairo Sinova1 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, Germany — 2Inst. of Physics Academy of Sciences of the Czech Republic, Praha, Czech Republic
Altermagnets are compensated magnets with unconventional d, g, and i-wave spin order in reciprocal space. So far the search for new altermagnetic candidates has been focused on materials in which the magnetic unit cell is identical to the non-magnetic one, i.e. magnetic structures with zero propagation vector. Here, we substantially broaden the family of altermagnetic candidates by predicting supercell altermagnets. Their magnetic unit cell is constructed by enlarging the nonmagnetic primitive unit cell, resulting in a non-zero propagation vector for the magnetic structure. This connection of the magnetic configuration to the ordering of sublattices gives an extra degree of freedom to supercell altermagnets, which can allow for the control over the order parameter spatial orientation. We identify realistic candidates MnSe2 with a d-wave order, and RbCoBr3, CsCoCr3, and BaMnO3 with g-wave order. We demonstrate the reorientation of the order parameter in MnSe2, which has two different magnetic configurations, whose energy difference is only 5 meV, opening the possibility of controlling the orientation of the altermagnetic order parameter by external perturbations.
Keywords: altermagnetism; spin splitting; spin symmetries; DFT