Lateral Josephson effect on the surface of Co3Sn2S2 magnetic Weyl semimetal
Abstract
We experimentally study lateral electron transport between two 5~μm spaced superconducting indium leads on a top of magnetic Weyl semimetal Co3Sn2S2. For the disordered magnetic state of Co3Sn2S2 crystal, we only observe the Andreev reflection in the proximity of each of the leads, which is indicative of highly transparent In-Co3Sn2S2 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~μm 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 Co3Sn2S2.
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