Noncentrosymmetric superconductor with a bulk three-dimensional Dirac cone gapped by strong spin-orbit coupling

Mazhar N. Ali, Quinn D. Gibson, T. Klimczuk, R. J. Cava

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93 Scopus citations

Abstract

The layered, noncentrosymmetric heavy element PbTaSe2 is found to be superconducting. We report its electronic properties accompanied by electronic-structure calculations. Specific heat, electrical resistivity, and magnetic-susceptibility measurements indicate that PbTaSe2 is a moderately coupled, type-II BCS superconductor (Tc=3.72 K, Ginzburg-Landau parameter κ=17) with an electron-phonon coupling constant of λep=0.74. Electronic-structure calculations reveal a single bulk three-dimensional Dirac cone at the K point of the Brillouin zone derived exclusively from its hexagonal Pb layer; it is similar to the feature found in graphene except there is a 0.8 eV gap opened by spin-orbit coupling. The combination of large spin-orbit coupling and lack of inversion symmetry also results in large Rashba splitting on the order of tenths of an eV.

Original languageEnglish (US)
Article number020505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number2
DOIs
StatePublished - Jan 14 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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