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A Weyl semimetal is a topologically non-trivial phase of matter that hostsmass-less Weyl fermions, the particles that remained elusive for more than 80years since their theoretical discovery. The Weyl semimetals exhibit uniquetransport and magneto-transport properties and remarkably high surface spinpolarization. Here we show that a unique mesoscopic superconducting phase witha critical temperature up to 7 K can be realized by forming metallic pointcontacts with silver (Ag) on single crystals of TaAs, while neither Ag nor TaAsare superconductors. The Andreev reflection spectra obtained from such pointcontacts are fitted well within a modified Blonder-Tinkham-Klapwijk (BTK) modelwith a superconducting energy gap up to 1.2 meV. The analysis within this modelalso reveals high transport spin polarization up to 60\% indicating a spinpolarized supercurrent flowing through the point contacts on TaAs. Such pointcontacts also show a large anisotropic magnetoresistance (AMR) originating fromthe spin polarized current. Therefore, apart from the discovery of a novelmesoscopic superconducting phase and it's coexistence with a large spinpolarization, our results also show that the point contacts on Weyl semimetalsare potentially important for applications in spintronics.

Mesoscopic superconductivity and high spin polarization coexisting at metallic point contacts on the Weyl semimetal TaAs