Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3 P superconductor

T. Shang, J. Philippe, J. A.T. Verezhak, Z. Guguchia, J. Z. Zhao, L. J. Chang, M. K. Lee, D. J. Gawryluk, E. Pomjakushina, M. Shi, M. Medarde, H. R. Ott, T. Shiroka

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7 Citations (Scopus)

Abstract

We report a comprehensive study of the noncentrosymmetric superconductor Mo3P. Its bulk superconductivity, with Tc=5.5K, was characterized via electrical-resistivity, magnetization, and heat-capacity measurements, while its microscopic electronic properties were investigated by means of muon-spin rotation/relaxation (μSR) and nuclear magnetic resonance (NMR) techniques. In the normal state, NMR relaxation data indicate an almost ideal metallic behavior, confirmed by band-structure calculations, which suggest a relatively high electron density of states, dominated by the Mo 4d orbitals. The low-temperature superfluid density, determined via transverse-field μSR and electronic specific heat, suggest a fully gapped superconducting state in Mo3P, with zero-temperature gap Δ0=0.83meV, the same as the BCS gap value in the weak-coupling case, and a zero-temperature magnetic penetration depth λ0=126nm. The absence of spontaneous magnetic fields below the onset of superconductivity, as determined from zero-field μSR measurements, indicates a preserved time-reversal symmetry in the superconducting state of Mo3P and, hence, spin-singlet pairing.

Original languageEnglish
Article number184513
JournalPhysical Review B
Volume99
Issue number18
DOIs
Publication statusPublished - 2019 May 23

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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