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    Shekhar, Chandra
    Chandra Shekhar
    Group leader
    Phone: +49 351 4646-3426
    Room: B3.3.26

    Topological materials

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    Ingrid Rothe
    Ingrid Rothe
    Phone:+49 351 4646-3001

    Public Relations

    Original Publication

    Leena Aggarwal, Sirshendu Gayen, Shekhar Das, Ritesh Kumar, Vicky Süß, Claudia Felser, Chandra Shekhar, and Goutam Sheet, "Mesoscopic superconductivity and high spin polarization coexisting at metallic point contacts on Weyl semimetal TaAs," Nature Communications 8, 1-8 (2017).

    Press Release

    Discovery of tip induced superconductivity in Weyl semimetal

    January 25, 2017

    A Weyl semimetal is a topologically non-trivial phase of matter that hosts mass-less Weyl fermions, particles that remained elusive for more than 80 years since their theoretical prediction by the German mathematical physicist Hermann Weyl in 1929, but discovered experimentally only in 2015. The Weyl semimetals exhibit unique electrical transport properties and remarkably high values of spin polarization of their electrons at their surfaces. One such Weyl semimetal is the compound TaAs.  A team of scientists from the Max Planck Institute of Chemical Physics of Solids Dresden, Germany in collaboration with scientists from the Indian Institute of Science Education and Research Mohali, India, have discovered that the superconducting phase with high critical temperature of Tc ~7 K. This superconducting phase is realized by forming the metallic point contacts with silver (Ag) on single crystals of TaAs, while neither Ag nor TaAs are superconductors. Andreev reflection spectroscopy of such point contacts reveals a superconducting gap of 1.2 meV that coexists with a high transport spin polarization of 60% indicating a highly spin-polarized supercurrent flowing through the point contacts on TaAs. Therefore, apart from the discovery of a novel mesoscopic superconducting phase, these results also show that point contacts on Weyl semimetals are potentially important for applications in spintronics. 

    CS / CPfS

    Signature of superconductivity in TaAs Weyl semimetal from point contact measurement.

    Signature of superconductivity in TaAs Weyl semimetal from point contact measurement.

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