Time-reversal symmetry breaking in the noncentrosymmetric Zr3Ir superconductor

T. Shang, S. K. Ghosh, J. Z. Zhao, L. J. Chang, C. Baines, M. K. Lee, D. J. Gawryluk, M. Shi, M. Medarde, J. Quintanilla, T. Shiroka

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2 Citations (Scopus)


We report the discovery of Zr3Ir as a structurally different type of unconventional noncentrosymmetric superconductor (with Tc=2.3 K), here investigated mostly via muon-spin rotation/relaxation (μSR) techniques. Its superconductivity was characterized using magnetic susceptibility, electrical resistivity, and heat capacity measurements. The low-temperature superfluid density, determined via transverse-field μSR and electronic specific heat, suggests a fully gapped superconducting state. The spontaneous magnetic fields, revealed by zero-field μSR below Tc, indicate the breaking of time-reversal symmetry in Zr3Ir and hence the unconventional nature of its superconductivity. By using symmetry arguments and electronic-structure calculations we obtain a superconducting order parameter that is fully compatible with the experimental observations. Hence, our results clearly suggest that Zr3Ir represents a structurally different member of noncentrosymmetric superconductors with broken time-reversal symmetry.

Original languageEnglish
Article number020503
JournalPhysical Review B
Issue number2
Publication statusPublished - 2020 Jul 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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