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Strong spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2 S2: Role of spin-orbit coupling

Howlader, S and Saha, S and Kumar, R and Nagpal, V and Patnaik, S and Das, T and Sheet, G (2020) Strong spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2 S2: Role of spin-orbit coupling. In: Physical Review B, 102 (10).

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Official URL: https://dx.doi.org/10.1103/PhysRevB.102.104434


Co3Sn2S2 has recently emerged as a ferromagnetic Weyl semimetal. Theoretical investigation of the spin-split bands predicted half metallicity in the compound. Here, we report the detection of a spin-polarized supercurrent through a Nb/Co3Sn2S2 point contact where Andreev reflection is seen to be large, indicating a large deviation from half metallicity. In fact, analysis of the Andreev reflection spectra reveals very small spin polarization at different points with the degree of spin polarization ranging from 20 to 50 at the Fermi level of Co3Sn2S2. Our theoretical calculations of electronic density of states reveal a spin-depolarizing effect near the Fermi energy when the role of spin-orbit coupling is included. The inclusion of spin-orbit coupling also reveals particle-hole asymmetry that explains a large asymmetry observed in our experimental Andreev reflection spectra. © 2020 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright of this article belongs to American Physical Society
Keywords: Astrophysics; Binary alloys; Depolarization; Ferromagnetic materials; Ferromagnetism; Point contacts; Spin orbit coupling; Spin polarization, Andreev reflection; Half-metallicity; Large deviations; Particle-hole asymmetry; Spin-polarized; Spin-split bands; Theoretical calculations; Theoretical investigations, Sulfur compounds
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 04 Feb 2021 05:21
Last Modified: 04 Feb 2021 05:21
URI: http://eprints.iisc.ac.in/id/eprint/67378

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