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arXiv 1301.7488cond-mat.mtrl-sci
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一种新的自旋无隙半导体族:四元Heusler化合物

A New Spin Gapless Semiconductors Family: Quaternary Heusler Compounds

G. Z. Xu, E. K. Liu, Y. Du, G. J. Li, G. D. Liu, W. H. Wang, G. H. Wu

摘要:

采用第一性原理计算,研究了一系列四元LiMgPdSn型Heusler化合物的能带结构.计算结果表明,CoFeMnSi,CoFeCrAl,CoMnCrSi,CoFeVSi和FeMnCrSb具有独特的电子结构,在一个自旋方向上具有半金属带隙,而在另一个自旋方向上具有零宽度带隙,表现出无自旋带隙的半导体行为.我们进一步分析了所有四元Heusler合金的电子和磁性,揭示了在Heusler化合物中识别自旋无隙半导体的半经验一般规律(总价电子数为26或28)。并讨论了晶格畸变和主族元素变化的影响。

英文摘要:

Using first-principles calculations, we investigate the band structures of a series of quaternary LiMgPdSn-type Heusler compounds. Our calculation results show that five compounds CoFeMnSi, CoFeCrAl, CoMnCrSi, CoFeVSi and FeMnCrSb possess unique electronic structures characterized by a half-metallic gap in one spin direction while a zero-width gap in the other spin direction showing spin gapless semiconducting behavior. We further analysis the electronic and magnetic properties of all quaternary Heusler alloys involved, and reveal a semi-empirical general rule (total valence electrons number being 26 or 28) for indentifying spin gapless semiconductors in Heusler compounds. The influences of lattice distortion and main-group element change have also been discussed.

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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