摘要
Using the first-principles calculations,we study the structural,electronic,and magnetic properties along with exchange interactions and Curie temperatures for CrZrCoZ(Z=Al,Ga,In,Tl,Si,Pb)quaternary Heusler alloys.The results show that the CrZrCoZ alloys are half-metallic ferrimagnets,and their total spin magnetic moments,which are mainly carried by the Cr atom,obey the Slater-Pauling rule.Analysis of local density of states confirms that the exchange splitting between eg and t2g states leads to the formation of half-metallic gap.According to the calculated Heisenberg exchange coupling parameters,it is found that the Cr(A)-Cr(A)and Cr(A)-Zr(B)exchanges dominate the appearance of ferrimagnetic states in CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys,and it is the Cr(A)-Zr(B)and Zr(B)-Zr(B)exchanges for CrZrCoSi alloy.Finally,we estimate the Curie temperatures of CrZrCoZ by using mean-field approximation,it is found that the CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys have noticeably higher Curie temperatures than room temperature.So,we expect that the CrZrCoZ alloys are promising candidates in spintronic applications in future.
作者
魏小平
曹铁义
孙小伟
高强
高配峰
高治磊
陶小马
Xiao-Ping Wei;Tie-Yi Cao;Xiao-Wei Sun;Qiang Gao;Peifeng Gao;Zhi-Lei Gao;Xiao-Ma Tao(The School of Mathematics and Physics,Lanzhou Jiaotong University,Lanzhou 730070,China;Institute of Materials Science,Technische Universitat Darmstadt,64287 Darmstadt,Germany;Key Laboratory of Mechanics on Western Disaster and Environment,Ministry of Education,College of Civil Engineering and Mechanics,Key Laboratory of Special Function Materials and Structure Design of Ministry of Education,Lanzhou University,Lanzhou 730000,China;School of Physical Science and Technology,Guangxi University,Nanning 530004,China)
基金
Project supported by the National Natural Science Foundation of China(Grant No.11864021)
Foundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University,China,the Key Talent Foundation of Gansu Province,China(Grant No.2020RCXM100)
Excellent Research Team of Lanzhou Jiaotong University,China(Grant No.201803).