Nonzero macroscopic magnetization in half-metallic antiferromagnets at finite temperatures

Details Nonzero macroscopic magnetization in half-metallic antiferromagnets at finite temperatures Nonzero macroscopic magnetization in half-metallic antiferromagnets at finite temperatures

2009-08-21

arxiv.org/abs/0908.3044v1

Phys. Rev. B 79, 100406(R) (2009)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

Combining density-functional theory calculations with many-body Green's-function technique, we reveal that the macroscopic magnetization in half-metallic antiferromagnets does not vanish at finite temperature as for the T=0 limit. This anomalous behavior stems from the inequivalent magnetic sublattices which lead to different intrasublattice exchange interactions. As a consequence, the spin fluctuations suppress the magnetic order of the sublattices in a different way leading to a ferrimagnetic state at finite temperatures. Computational results are presented for the half-metallic antiferromagnetic CrMnZ (Z=P,As,Sb) semi-Heusler compounds.

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