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首页> 外文期刊>Physical review >Electronic, magnetic, and transport properties and magnetic phase transition in quaternary (Cu,Ni)MnSb Heusler alloys
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Electronic, magnetic, and transport properties and magnetic phase transition in quaternary (Cu,Ni)MnSb Heusler alloys

机译：季（Cu，Ni）MnSb Heusler合金的电子，磁性和输运性质以及磁性相变

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摘要

The electronic properties, finite-temperature magnetism, and transport properties of semi-Heusler quaternary alloys (Cu,Ni)MnSb are studied theoretically by means of ab initio calculations as a function of the alloy composition. As documented by experiment, the transition from the ferromagnetic state (NiMnSb) to the antiferromagnetic state (CuMnSb) gives rise to an abrupt change in the magnetic moments and resistivities at about x_(Cu) ≈ 0.7, while the Curie temperature exhibits a smooth behavior with the Cu content. We explain this peculiar behavior with the onset of disorder in orientations of the Mn spins at x_(Cu) ≈ 0.7. A simple account of magnetic disorder based on the so-called uncompensated disordered local-moment picture provides a good quantitative understanding of available experimental data. An origin of the observed magnetic phase transition is also discussed.
机译：理论上，通过从头算来根据合金成分对半赫斯勒四元合金（Cu，Ni）MnSb的电子性质，有限温度磁性和传输性质进行了研究。实验证明，从铁磁态（NiMnSb）到反铁磁态（CuMnSb）的转变会在大约x_（Cu）≈0.7的情况下引起磁矩和电阻率的突然变化，而居里温度则表现出平稳的行为与铜含量。我们用在x_（Cu）≈0.7时Mn自旋取向的无序现象来解释这种特殊的行为。基于所谓的未补偿的无序局部矩图像的磁异常的简单说明可以很好地定量了解可用的实验数据。还讨论了观察到的磁性相变的起源。

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