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arXiv 0901.0272cond-mat.mtrl-sci
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BaMn $_2$ As $_2$和BaMn $_2$ Sb $_2$的电子结构和磁性

Electronic structure and Magnetism in BaMn$_2$As$_2$ and BaMn$_2$Sb$_2$

J. an, A. S. Sefat, D. J. Singh, M. H. Du

摘要:

本文用密度泛函理论计算和实验测量的方法研究了BaMn $_2$ As $_2$和BaMn $_2$ Sb $_2$单晶样品的性质。这些材料是具有中等带隙反铁磁半导体基态的局部磁矩磁体。电子结构显示出实质性的Mn -氮族元素杂化,其稳定了标称$d^5$ Mn的中间自旋构型。结果进行了讨论的背景下,可能的热电应用和相应的铁/钴/镍化合物Ba(Fe,Co,Ni)$_2$作为$_2$的关系。

英文摘要:

We study the properties of ThCr$_2$Si$_2$ structure BaMn$_2$As$_2$ and BaMn$_2$Sb$_2$ using density functional calculations of the electronic and magnetic as well experimental measurements on single crystal samples of BaMn$_2$As$_2$. These materials are local moment magnets with moderate band gap antiferromagnetic semiconducting ground states. The electronic structures show substantial Mn - pnictogen hybridization, which stabilizes an intermediate spin configuration for the nominally $d^5$ Mn. The results are discussed in the context of possible thermoelectric applications and the relationship with the corresponding iron / cobalt / nickel compounds Ba(Fe,Co,Ni)$_2$As$_2$.

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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