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arXiv 0811.1408cond-mat.mtrl-sci
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通过sp电子替代调节半金属半Heusler合金的磁性能:AuMnSn $_{1-x}$ Sb $_x$四元合金的情况

Tuning the magnetic properties of half-metallic semi-Heusler alloys by sp-electron substitution: The case of AuMnSn$_{1-x}$Sb$_x$ quaternary alloys

K. Ozdogan, I. Galanakis, E. Sasioglu

摘要:

利用第一性原理计算研究了四元AuMnSn $_{1-x}$ Sb $_{x}$ Heusler合金的电子和磁性.我们确定他们的磁相图,我们表明,他们提出了一个从铁磁到反铁磁状态的相变与Sb浓度的增加。对于大锑浓度的反铁磁超交换耦合占主导地位的铁磁RKKY样交换机制。这种行为与作者最近研究的等价Ni $_{1-x}$ Cu $_x$ MnSb合金所证明的行为相似[I. Galanakis等人,Phys.Rev.B. \textbf{77},214417(2008)]。因此,\textit{sp} -电子(Sn和Sb原子)的浓度的变化和非磁性\textit{3d}原子(Cu)的浓度的变化导致Heusler合金的磁性质的类似调谐。我们表明,列入相关效应不改变相图。计算结果与实验数据吻合较好。

英文摘要:

We study the electronic and magnetic properties of the quaternary AuMnSn$_{1-x}$Sb$_{x}$ Heusler alloys using first principles calculations. We determine their magnetic phase diagram and we show that they present a phase transition from a ferromagnetic to an antiferromagnetic state with increasing Sb concentration. For large Sb concentrations the antiferromagnetic superexchange coupling dominates over the ferromagnetic RKKY-like exchange mechanism. This behavior is similar to the one demonstrated by the isovalent Ni$_{1-x}$Cu$_x$MnSb alloy studied recently by the authors [I. Galanakis et al, Phys. Rev. B. \textbf{77}, 214417 (2008)]. Thus the variation of the concentration of the \textit{sp}-electrons (Sn and Sb atoms) and the variation of the concentration of the non-magnetic \textit{3d} atoms (Cu) lead to a similar tuning of the the magnetic properties of the Heusler alloys. We show that the inclusion of correlation effects does not alter the phase diagram. Calculated results are in good agreement with the available experimental data.

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