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MA: Fachverband Magnetismus
MA 33: Altermagnets IV
MA 33.10: Vortrag
Mittwoch, 11. März 2026, 17:30–17:45, HSZ/0002
Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La2O3Mn2Se2 — •Laura Garcia-Gassull1, Aleksandar Razpopov1, Panagiotis P. Stavropoulos1, Igor I. Mazin2, and Roser Valentí1 — 1Goethe-Universität Frankfurt, Germany — 2George Mason University, Fairfax, USA
Our analysis on the altermagnetic candidate La2O3Mn2Se2, realized on an inverse Lieb lattice, combines ab initio calculations, analytical modeling and spin-wave theory. We resolve a contradiction within the existing literature, where the GKA rules for half-filled orbitals have been applied, instead of the high-spin configuration ones. By studying the exchange pathways we show that the antiferromagnetic nearest-neighbor dominates over the next-nearest-neighbor coupling, since both direct exchange and superexchange cooperatively stabilize the magnetic ground state.
Going beyond static interactions, we compute the magnon spectrum within linear spin-wave theory and identify experimental signatures of the altermagnetic exchange, a characteristic chiral splitting of magnon bands driven the inequivalent second-neighbor exchanges.
Our work not only clarifies the microscopic origin of altermagnetism, but also offers concrete predictions for its experimental verification, reinforcing La2O3Mn2Se2 as a model system for studying altermagnetic physics. You can find more details at: https://arxiv.org/pdf/2506.21661.
We thank the (DFG) through the TRR 288 (project B05).
Keywords: Inverse Lieb lattice; High-spin configuration; GKA rules; DFT; Spintronics