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arXiv · 1909.09062

Lateral Josephson effect on the surface of Co$_3$Sn$_2$S$_2$ magnetic Weyl semimetal

O. O. Shvetsov·V. D. Esin·Yu. S. Barash·A. V. Timonina·N. N. Kolesnikov·E. V. Deviatov
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Abstract

We experimentally study lateral electron transport between two 5~$μ$m spaced superconducting indium leads on a top of magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$. For the disordered magnetic state of Co$_3$Sn$_2$S$_2$ crystal, we only observe the Andreev reflection in the proximity of each of the leads, which is indicative of highly transparent In-Co$_3$Sn$_2$S$_2$ interfaces. If the sample is homogeneously magnetized, it demonstrates well-developed anomalous Hall effect state. In this regime we find the Josephson current that takes place even for 5~$μ$m long junctions and shows the unusual magnetic field and temperature dependencies. As a possible reason for the results obtained, we discuss the contribution to the proximity-induced spin-triplet Josephson current from the topologically protected Fermi-arc states on the surface of Co$_3$Sn$_2$S$_2$.

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O. O. Shvetsov, V. D. Esin, Yu. S. Barash, A. V. Timonina, N. N. Kolesnikov, E. V. Deviatov. 2020-01-24. Lateral Josephson effect on the surface of Co$_3$Sn$_2$S$_2$ magnetic Weyl semimetal. https://doi.org/10.1103/physrevb.101.035304

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