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Abstract: Combining density-functional theory calculations with many-bodyGreen-s-function technique, we reveal that the macroscopic magnetization inhalf-metallic antiferromagnets does not vanish at finite temperature as for theT=0 limit. This anomalous behavior stems from the inequivalent magneticsublattices which lead to different intrasublattice exchange interactions. As aconsequence, the spin fluctuations suppress the magnetic order of thesublattices in a different way leading to a ferrimagnetic state at finitetemperatures. Computational results are presented for the half-metallicantiferromagnetic CrMnZ Z=P,As,Sb semi-Heusler compounds.



Author: Ersoy Sasioglu

Source: https://arxiv.org/







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