First-principles calculations of finite temperature electronic structures and transport properties of Heusler alloy Co2MnSi

H. Shinya, S. Kou, T. Fukushima, A. Masago, K. Sato, H. Katayama-Yoshida, H. Akai

研究成果: Article査読

2 被引用数 (Scopus)

抄録

In this study, we calculate the temperature-dependent electronic structures and transport properties of the Heusler alloy Co2MnSi on the basis of the Korringa-Kohn-Rostoker Green's function method combined with the coherent potential approximation (CPA). Temperature effects often have a significant influence on the spin-polarization properties of Heusler alloys. To incorporate the contributions of temperature effects, we first consider lattice vibrations and spin fluctuations. Using CPA, we can replace them with random displacements due to local phonons and local magnetic moment disorders, respectively. In the Co2MnSi Heusler alloy, we found that the band structures are smeared by the electron-phonon scattering process and the half-metallic property is eliminated by magnon excitations from the spin-up to spin-down states. Furthermore, we can estimate the electrical resistivity as a function of temperature in the scheme of linear response theory. Including the local phonon disorder, local moment disorder, and Mn-Co antisite disorder in CPA, we can reproduce the temperature-dependent resistivity observed by experiments.

本文言語English
論文番号042402
ジャーナルApplied Physics Letters
117
4
DOI
出版ステータスPublished - 2020 7 27

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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