Ab initio plus analytical analysis shows multiorbital Mn2+ character produces dominant antiferromagnetic nearest-neighbor exchange in La2O3Mn2Se2 altermagnet, yielding identifiable magnon signatures.
Heine, The renaissance and the quantitative develop- ment of the tight-binding method, in Solid State Physics , Vol
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Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La$_2$O$_3$Mn$_2$Se$_2$
Ab initio plus analytical analysis shows multiorbital Mn2+ character produces dominant antiferromagnetic nearest-neighbor exchange in La2O3Mn2Se2 altermagnet, yielding identifiable magnon signatures.