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MoTe2 is a Weyl semimetal, which exhibits unique non-saturatingmagnetoresistance and strongly reinforced superconductivity under pressure.Here, we demonstrate that a novel mesoscopic superconductivity at ambientpressure arises on the surface of MoTe2 with a critical temperature up to 5 Ksignificantly exceeding the bulk Tc=0.1K. We measured the derivatives of I-Vcurves for metallic hetero-contacts of MoTe2 with Ag or Cu, homo-contacts ofMoTe2 as well as "soft" point contacts (PCs). Large number of thesehetero-contacts exhibit a dV/dI dependence, which is characteristic for Andreevreflection. It allows to determine the superconducting gap \Delta. The averagegap values are 2\Delta=1.30+/-0.15 meV with a 2\Delta/kBTc ratio of 3.7+/-0.4,which slightly exceeds the standard BCS value of 3.52. Furthermore, thetemperature dependence of the gap follows a BCS-like behavior, which points toa nodeless superconducting order parameter with some strong-couplingrenormalization. Remarkably, the observation of a "gapless-like" single minimumin the dV/dI of "soft" PCs may indicate a topological superconducting state ofthe MoTe2 surface as these contacts probe mainly the interface and avoidadditional pressure effect. Therefore, MoTe2 might be a suitable material tostudy new forms of topological superconductivity.

Surface superconductivity in the Weyl semimetal MoTe2 detected by point contact spectroscopy