Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La$_2$O$_3$Mn$_2$Se$_2$

[2506.21661] Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La$_2$O$_3$Mn$_2$Se$_2$ Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Condensed Matter > Strongly Correlated Electrons arXiv:2506.21661 (cond-mat) [Submitted on 26 Jun 2025] Title: Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La$_2$O$_3$Mn$_2$Se$_2$ Authors: Laura Garcia-Gassull , Aleksandar Razpopov , Panagiotis Peter Stavropoulos , Igor I Mazin , Roser Valentí View a PDF of the paper titled Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La$_2$O$_3$Mn$_2$Se$_2$, by Laura Garcia-Gassull and 3 other authors View PDF HTML (experimental) Abstract: Altermagnets (AM) are a recently introduced type of magnets, with no net magnetization like antiferromagnets, but displaying a non-relativistic Zeeman splitting in reciprocal space like ferromagnets. One of the lately discussed models to realize AM is the inverse Lieb lattice (ILL). Initially suggested as a purely theoretical construct, the ILL occurs in real materials such as La$_2$O$_3$Mn$_2$Se$_2$. However, AM on the ILL requires 90$^\circ$ nearest-neighbor superexchange to be {\it antiferromagnetic} and dominant over the 180$^\circ$ next-nearest-neighbor superexchange, in apparent contradiction to the Goodenough-Kanamori-Anderson (GKA) rules. Yet, AM ordering was found to be the ground state in La$_2$O$_3$Mn$_2$Se$_2$. Combining ab initio and analytical methods, we determine how direct exchange and superexchange act together to produce a large antiferromagnetic nearest-neigbor coupling. The seeming contradiction with the GKA rules is traced back to the multiorbital character of Mn$^{+2}$ ions. By calculating magnon bands, we identify universal signatures of the exchange interactions, suggesting experimental fingerprints. Comments: 8 pages, 4 figures + references and supplemental information Subjects: Strongly Correlated Electrons (cond-mat.str-el) Cite as: arXiv:2506.21661 [cond-mat.str-el] (or arXiv:2506.21661v1 [cond-mat.str-el] for this version) https://doi.org/10.48550/arXiv.2506.21661 Focus to learn more arXiv-issued DOI via DataCite Related DOI : https://doi.org/10.1038/s44306-025-00125-9 Focus to learn more DOI(s) linking to related resources Submission history From: Laura Garcia-Gassull Areitio [ view email ] [v1] Thu, 26 Jun 2025 18:00:01 UTC (3,307 KB) Full-text links: Access Paper: View a PDF of the paper titled Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La$_2$O$_3$Mn$_2$Se$_2$, by Laura Garcia-Gassull and 3 other authors View PDF HTML (experimental) TeX Source view license Current browse context: cond-mat.str-el < prev | next > new | recent | 2025-06 Change to browse by: cond-mat References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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