Split Fermi Surface Properties of Noncentrosymmetric Compounds Fe2P, Ni2P, and Pd2Si

Yoshichika Onuki, Ai Nakamura, Dai Aoki, Tatsuma D. Matsuda, Yoshinori Haga, Hisatomo Harima, Tetsuya Takeuchi, Yoshio Kaneko

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Abstract

We grew single crystals of Fe2P, Ni2P, and Pd2Si with a noncentrosymmetric Fe2P-type hexagonal structure, studied their Fermi surface properties by de Haas-van Alphen (dHvA) experiments, and compared results with energy band calculations. In paramagnets Ni2P and Pd2Si, the detected dHvA branches are well explained by the results of full potential linear augmented plane wave (FLAPW) band calculations. Because of the noncentrosymmetric crystal structure, the energy band splits, leading to two split Fermi surfaces. The angular dependences of dHvA frequencies for the main split Fermi surfaces are highly anisotropic, which is not observed for H ∥ [0001] but observed for H ⊥ [0001]. The splitting energy due to the antisymmetric spin-orbit coupling is approximately estimated to be Δϵ ≃ 300K in Ni2P and 500K in Pd2Si for H ∥ [1010]. This is a characteristic feature of the split Fermi surfaces in these compounds. In the case of a ferromagnet Fe2P, only one kind of spin-split dHvA branch was observed.

Original languageEnglish
Article number064712
JournalJournal of the Physical Society of Japan
Volume91
Issue number6
DOIs
Publication statusPublished - 2022 Jun 15

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