Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Transport: Weyl Semimetals
TT 24.4: Vortrag
Dienstag, 8. März 2016, 10:30–10:45, H18
Superconductivity in Weyl Semimetal Candidate MoTe2 — •Yanpeng Qi1, Pavel Naumov1, Mazhar Ali2, Catherine Rajamathi1, Oleg Barkalov1, Michael Hanfland3, Shu-Chun Wu1, Chandra Shekhar1, Yan Sun1, Vicky Süß1, Marcus Schmidt1, Ulrich Schwarz1, Eckhard Pippel4, Peter Werner4, Reinald Hillebrand4, Tobias Förster5, Erik Kampert5, Walter Schnelle1, Stuart Parkin4, Robert Cava2, Claudia Felser1, Binghai Yan1,6, and Sergey Medvedev1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Department of Chemistry, Princeton University, Princeton, USA — 3European Synchrotron Radiation Facility, Grenoble, France — 4Max Planck Institute of Microstructure Physics,Halle, Germany — 5Dresden High Magnetic Field Laboratory,Dresden, Germany — 6Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
In this work, we investigate the sister compound of WTe2, MoTe2, which is also predicted to be a Weyl semimetal and a quantum spin Hall insulator in bulk and monolayer form, respectively. We find that MoTe2 exhibits superconductivity with a resistive transition temperature Tc of 0.1 K. The application of a small pressure is shown to dramatically enhance the Tc, with a maximum value of 8.2 K being obtained at 11.7 GPa (a more than 80-fold increase in Tc). This yields a dome-shaped superconducting phase diagram. Further explorations into the nature of the superconductivity in this system may provide insights into the interplay between superconductivity and topological physics.