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arXiv 0908.3044cond-mat.mtrl-sci
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有限温度下半金属反铁磁体的非零宏观磁化强度

Nonzero macroscopic magnetization in half-metallic antiferromagnets at finite temperatures

Ersoy Sasioglu

摘要:

结合密度泛函理论计算和多体格林函数技术,我们揭示了半金属反铁磁体的宏观磁化强度在有限温度下并不像T=0极限那样为零.这种反常行为源于磁子晶格的不等价,导致不同的子晶格内交换相互作用。因此,自旋涨落以不同的方式抑制了亚晶格的磁序,导致在有限温度下的亚铁磁态。本文给出了半金属反铁磁CrMnZ(Z=P,As,Sb)半Heusler化合物的计算结果。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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