Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2

Shyam Sundar, S. R. Dunsiger, S. Gheidi, K. S. Akella, A. M. Côté, H. U. Özdemir, N. R. Lee-Hone, D. M. Broun, E. Mun, F. Honda, Y. J. Sato, T. Koizumi, R. Settai, Y. Hirose, I. Bonalde, J. E. Sonier

Research output: Contribution to journalArticlepeer-review

Abstract

We report a μSR investigation of a noncentrosymmetric superconductor (LaNiC2) in single-crystal form. Compared to previous μSR studies of noncentrosymmetric superconducting polycrystalline and powder samples, the unambiguous orientation of single crystals enables a simultaneous determination of the absolute value of the magnetic penetration depth and the vortex core size from measurements that probe the magnetic field distribution in the vortex state. The magnetic field dependence of these quantities unambiguously demonstrates the presence of two nodeless superconducting energy gaps. In addition, we detect weak internal magnetic fields in the superconducting phase, confirming earlier μSR evidence for a time-reversal symmetry-breaking superconducting state. Our results suggest that Cooper pairing in LaNiC2 is characterized by an interorbital equal-spin pairing model introduced to unify the pairing states of LaNiC2 and the centrosymmetric superconductor LaNiGa2.

Original languageEnglish
Article number014511
JournalPhysical Review B
Volume103
Issue number1
DOIs
Publication statusPublished - Jan 20 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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