Strong spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2 : Role of spin-orbit coupling
| Autor: | Sandeep Howlader, Ritesh Kumar, Vipin Nagpal, Tanmoy Das, Goutam Sheet, Surabhi Saha, Satyabrata Patnaik |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Degree (graph theory) Spin polarization Condensed matter physics Fermi level Weyl semimetal Fermi energy 02 engineering and technology Spin–orbit interaction 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Andreev reflection symbols.namesake 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.104434 |
| Popis: | ${\mathrm{Co}}_{3}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$ 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 $\mathrm{Nb}/{\mathrm{Co}}_{3}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$ 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 ${\mathrm{Co}}_{3}{\mathrm{Sn}}_{2}{\mathrm{S}}_{2}$. 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. |
| Databáze: | OpenAIRE |
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