摘要
We present the microscopic origin of the ferromagnetism of Feo.25TaS2 and its finite-temperature magnetic properties.The band structures of Feo.25TaS2 are first obtained by the first-principles calculations and it is found that both conventional and Dirac carriers coexist in metallic Feo.25TaS2-Accordingly,considering the spin-orbit coupling of Fe 3d ion,we derive an effective Ruderman-Kittle-Kasuya-Yosida-type Hamiltonian between Fe spins in the presence of both the conventional parabolic-dispersion and the Dirac linear-dispersion carriers,which contains a Heisenberg-like,an Ising-like and an XY-like term.In addition,we obtain the ferromagnetic Curie temperature Tc by using the cluster self-consistent Held method.Our results could address not only the high ferromagnetic Curie temperature but also the large magnetic anisotropy in Fex TaS2.
作者
Jin-Hua Wang
Ya-Min Quan
Da-Yong Liu
Liang-Jian Zou
王金华;全亚民;刘大勇;邹良剑(Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026)
基金
the National Natural Science Foundation of China under Grant Nos 11774350,11534010 and 11574315.
作者简介
Corresponding author:邹良剑,Email:zou@theory.issp.ac.cn。
