%0 Journal Article
%T Heusler合金M2CoA(M=Mn,Ti;A=Al,Si)的第一性原理<br>First-principles investigation of Heusler alloys M2CoA(M=Mn,Ti;A=Al,Si)
%A 林道斌
%A 萨百晟
%A 周健
%A 司晨
%A 孙志梅
%J 北京航空航天大学学报
%D 2016
%R 10.13700/j.bh.1001-5965.2015.0201
%X 摘要 采用基于密度泛函理论(DFT)的第一性原理计算方法,研究了M2CoA型Heusler合金Mn2CoAl、Mn2CoSi、Ti2CoAl和Ti2CoSi的电子结构和磁学性质。发现Heusler合金Mn2CoAl是亚铁磁性自旋无带隙半导体,Mn2CoSi与Ti2CoAl是亚铁磁性自旋半金属,而Ti2CoSi是铁磁性自旋半金属。它们的总自旋磁矩均为整数,符合Slater-Pauling规则。然后,在分析电子能带结构和态密度的基础上,探讨了自旋无带隙半导体与半金属性的根源。最后,声子谱和弹性常数计算结果表明所有M2CoA型Heusler合金在晶格动力学和力学上均是稳定的。<br>Abstract：The electronic structure and magnetic properties of the M2 CoA type Heusler alloys Mn2CoAl, Mn2CoSi, Ti2CoAl and Ti2CoSi were systematically investigated using first-principles calculations based on the density functional theory. The results show that Mn2CoAl is a ferrimagnetic spin gapless semiconductor; Mn2CoSi and Ti2CoAl are ferrimagnetic spin half-metals, while Ti2CoSi is a ferromagnetic spin half-metal. The total spin magnetic moments of the M2CoA type Heusler alloys are integers, obeying the Slater-Pauling rule. By analyzing the band structures and electronic density of states, the origin of spin gapless semiconductor as well as half-metal were revealed. The calculation results of phonon dispersion curves and elastic constants show that all the M2CoA type Heusler alloys are stable in the lattice dynamics and mechanics.
%K Heusler合金
%K 第一性原理
%K 自旋无带隙半导体
%K 半金属
%K Slater-Pauling规则&lt
%K br&gt
%K Heusler alloy
%K first-principles
%K spin gapless semiconductor
%K half-metal
%K Slater-Pauling rule
%U http://bhxb.buaa.edu.cn/CN/abstract/abstract13815.shtml