arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0909.1245cond-mat.mtrl-sci
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基于第一性原理的FeN的结构稳定性和磁性

Structural stability and magnetism of FeN from first principles

A. Houari, S. F. Matar, M. A. Belkhir, M. Nakhl

摘要:

在密度泛函理论(DFT)的框架下,采用全电子增广球面波方法(ASW),采用广义梯度GGA泛函处理交换和关联效应,研究了FeN单氮化物的结构和磁性.通过对假定的岩盐型(RS)、锌盐型(ZB)和纤锌矿型(W)结构的能量-体积关系的计算表明,RS型结构比其它结构更稳定。平衡体积下的自旋极化计算结果表明,RS-FeN的基态是高磁矩的铁磁性,而ZB-FeN和W-FeN是非磁性的。畸变对稳定性的影响考虑到考虑FeN在两个不同的面心四面体结构(FCT):FCT岩盐和FCT锌。讨论了Slater-Pauling-Friedel模型的磁体积效应。报道了从位和自旋投影态密度分析的电子结构。讨论了FeN的结构和磁性,给出了相对于Fe的N局域环境。

英文摘要:

In the framework of density functional theory (DFT), the structural and magnetic properties of FeN mono nitride 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. Calculation of the energy versus volume in hypothetic rocksalt (RS), zinc-blende (ZB) and wurtzite (W) types structures shows that the RS-type structure is more stable than the others. Spin polarized calculation results at equilibrium volume indicate that the ground state of RS-FeN is ferromagnetic with a high moment, while ZB-FeN and W-FeN are non magnetic. The influence of distortions on the stability is taken into account by considering FeN in two different face-centred tetragonal structures (fct): fct-rocksalt and fct-zincblende. The magnetovolume effects with respect to Slater-Pauling-Friedel model are discussed. The electronic structures analyzed from site and spin projected density of states are reported. A discussion of the structural and magnetic properties of FeN is given with respect to N local environment of Fe.

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