| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Ferromagnetism in Layered Metallic Fe$_{1/4}$TaS$_{2}$ in the Presence of Conventional and Dirac Carriers |
| Jin-Hua Wang1,2, Ya-Min Quan1, Da-Yong Liu1, Liang-Jian Zou1,2** |
1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031
2Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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Jin-Hua Wang, Ya-Min Quan, Da-Yong Liu et al 2020 Chin. Phys. Lett. 37 017101 |
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Abstract We present the microscopic origin of the ferromagnetism of Fe$_{0.25}$TaS$_{2}$ and its finite-temperature magnetic properties. The band structures of Fe$_{0.25}$TaS$_{2}$ are first obtained by the first-principles calculations and it is found that both conventional and Dirac carriers coexist in metallic Fe$_{0.25}$TaS$_{2}$. 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 $T_{\rm c}$ 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 Fe$_{x}$TaS$_{2}$.
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Received: 11 October 2019
Published: 23 December 2019
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| PACS: |
71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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75.30.Hx
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(Magnetic impurity interactions)
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75.10.-b
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(General theory and models of magnetic ordering)
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75.30.Gw
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(Magnetic anisotropy)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11774350, 11534010 and 11574315. |
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