Nodeless superconductivity in the type-II Dirac semimetal PdTe2: London penetration depth and pairing-symmetry analysis

ORAL

Abstract

London penetration depth and normal-state resistivity were measured in single crystals of type-II Dirac semimetal PdTe2. Superfluid density is exponential at low temperatures and follows single-gap BCS model with weak-coupling Delta(0)/Tc = 1.76 in the whole temperature range. Electrical resistivity is compatible with a classical metal with dominant electron-phonon scattering obtained from the fit to Bloch-Grüneisen formula with a Debye temperature of 207 K from specific heat data. We compare these experimental results with expectations from a detailed theoretical symmetry analysis and reduce the number of possible superconducting pairing states in PdTe2 to only three nodeless candidates: a regular, topologically trivial s-wave pairing, and two distinct odd-parity triplet states that both can be topologically nontrivial depending on the microscopic interactions driving the superconducting instability. Finally, we theoretically discuss the effect of disorder on the different pairing states.

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Presenters

  • Peter Orth

    Iowa State University, Physics, Iowa State University

Authors

  • Peter Orth

    Iowa State University, Physics, Iowa State University

  • Serafim Teknowijoyo

    Iowa State University, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA

  • Na Hyun Jo

    Iowa State University, Iowa State University and Ames Laboratory, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Department of Physics & Astronomy, Iowa State University, Department of Physics and Astronomy, Iowa State University, Department of physics and astronomy, Iowa State University/Ames Laboratory, Physics, Iowa State University/Ames Laboratory

  • Mathias Scheurer

    Department of Physics, Harvard University, Harvard University

  • Makariy A Tanatar

    Iowa State University, Ames Laboratory and Iowa state University, USA, Ames Laboratory

  • Kyuil Cho

    Ames Laboratory US DOE, Ames, Iowa, Ames Laboratory, Ames Laboratory and Iowa state University, USA, Ames Laboratory and Iowa State University, Ames, IA, USA, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA

  • Sergey Budko

    Iowa State University, Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA, Ames Laboratory, Iowa State University, Ames Laboratory/Iowa State University, Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ., Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA, Ames Lab & Dept of Physics and Astronomy, Iowa State University, Physics, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory

  • P.C. Canfield

    Iowa State University, Physics and Astronomy, Ames Laboratory and Iowa State University

  • Ruslan Prozorov

    Ames Laboratory US DOE, Ames, Iowa, Iowa State University, Ames Laboratory, Iowa State University, Ames Laboratory, Ames Laboratory and Iowa state University, USA, Ames Laboratory and Iowa State University, Ames, IA, USA, Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA