Ferromagnetism in Layered Metallic Fe1/4TaS2 in the Presence of Conventional and Dirac Carriers

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 51-55
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/1/017101

摘要

We present the microscopic origin of the ferromagnetism of Fe0.25TaS2 and its finite-temperature magnetic properties.The band structures of Fe0.25TaS2 are first obtained by the first-principles calculations and it is found that both conventional and Dirac carriers coexist in metallic Fe0.25 TaS2.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 field method.Our results could address not only the high ferromagnetic Curie temperature but also the large magnetic anisotropy in FexTaS2.