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arXiv 0909.1676cond-mat.mtrl-sci
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Mn取代ScN的稳定性和磁性

Stability and magnetic properties of Mn-substituted ScN from first principles

Abdesalem Houari, Samir. F. Matar, Mohamed A. Belkhir

摘要:

本文采用自旋密度泛函理论研究了半导体ScN和Mn取代的ScN。用全电子增广球面波方法(ASW)和广义梯度GGA泛函处理交换和关联效应,研究了它们的结构和磁性.能带结构计算表明,ScN是一种半导体材料,其间接带隙$Γ$ -X为0.54 eV.总能量与体积的计算表明,三元Sc $_{0.75}$ Mn $_{0.25}$ N氮化物是更稳定的面心四方岩盐(fct岩盐)结构,实验发现,比立方岩盐之一。理论平衡下的自旋极化结果表明,Sc $_{0.75}$ Mn $_{0.25}$ N的基态是铁磁性的,Mn原子的磁矩为3.44 $μ_B$,Sc和N原子的磁矩为零.讨论了Mn替代ScN晶格的磁体积效应。从网站/自旋投影态密度和化学键的电子结构分析,无论是一氮化物和三元合金,报告。讨论了Sc $_{0.75}$ Mn $_{0.25}$ N的结构和磁性,并与ScN进行了比较,以了解Mn取代效应。

英文摘要:

We present a spin density functional theory (DFT) study for semiconducting ScN and Mn-substituted ScN. Their structural and magnetic properties have been investigated using the all electrons augmented spherical wave method (ASW) with a generalized gradient GGA functional for treating the effects of exchange and correlation. Band structure calculations show that ScN is semiconductor with a narrow indirect band gap $Γ$-X of 0.54 eV. The total-energy versus volume calculations show that ternary Sc$_{0.75}$Mn$_{0.25}$N nitride is more stable in face centered tetragonal-rocksalt (fct-rocksalt) structure, found experimentally, than the cubic rocksalt one. Spin polarized results, at theoretical equilibrium, indicate that the ground state of Sc$_{0.75}$Mn$_{0.25}$N is ferromagnetic with a high moment at Mn-atom (3.44$μ_B$), and zero moment on Sc and N ones. The magnetovolume effects of Mn-substitution in ScN lattice are discussed. The electronic structures analyzed from site/spin projected density of states and chemical bonding, for both the mononitride and the ternary alloy, are reported. A discussion of the structural and magnetic properties of Sc$_{0.75}$Mn$_{0.25}$N is given with a comparison to ScN, in order to get insights of the Mn-substitution effects.

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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