Heusler 合金 Mn2CoAl:结构、磁性和电子特性

IF 3.1 3区 物理与天体物理 Q2 PHYSICS, APPLIED
J Y Yang, X J Xiang, Z J Tan, X K Zhang, S Pan, J Chen and G Z Xu
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引用次数: 0

摘要

在本研究中,我们报告了 Heusler 合金 Mn2CoAl 的详细原子排序、磁性和电性,研究采用了实验方法和理论计算相结合的方法。我们的研究证实了 Mn2CoAl 的 Hg2CuTi- 型晶体结构,其中锰(B:1/4,1/4,1/4)和钴(C:1/2,1/2,1/2)位之间存在 25% 的反位错乱。中子粉末衍射测量确定了 Mn:A↓ 和 Mn:B↑, Co:C↑ 之间的反平行自旋耦合,从而形成了室温下净磁矩为 ∼1.6 μB 的铁磁结构。在电子计算方面,我们发现反位原子将在费米级贡献大的态密度,从而破坏无自旋隙带结构,使 Mn2CoAl 成为正常的铁磁性金属。本报告旨在建立对 Mn2CoAl 结构和物理性质的基本认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Heusler alloy Mn2CoAl: structural, magnetic and electronic properties
In this study, we report on the detailed atomic ordering, magnetic and electrical properties of the Heusler alloy Mn2CoAl, studied via combined experimental methods and a theoretical calculation approach. Our studies confirm the Hg2CuTi-type crystal structure of Mn2CoAl with 25% anti-site disorder between Mn (B:1/4,1/4,1/4) and Co(C:1/2,1/2,1/2) sites. Neutron powder diffraction measurements identify the antiparallel spin couplings between Mn:A↓ and Mn:B↑, Co:C↑, resulting in a ferrimagnetic structure with a net magnetic moment of ∼1.6 μB at room temperature. In terms of the electronic calculations, we find that the anti-site atoms will contribute large densities of states at the Fermi level, thus destroying the spin gapless band structure and making Mn2CoAl a normal ferrimagnetic metal. This report is intended to establish a basic understanding of the structure and physical properties of Mn2CoAl.
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来源期刊
Journal of Physics D: Applied Physics
Journal of Physics D: Applied Physics 物理-物理:应用
CiteScore
6.80
自引率
8.80%
发文量
835
审稿时长
2.1 months
期刊介绍: This journal is concerned with all aspects of applied physics research, from biophysics, magnetism, plasmas and semiconductors to the structure and properties of matter.
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