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

研究成果: Article

摘要

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.

原文English
文章編號020503
期刊Physical Review B
102
發行號2
DOIs
出版狀態Published - 2020 七月 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Shang, T., Ghosh, S. K., Zhao, J. Z., Chang, L. J., Baines, C., Lee, M. K., Gawryluk, D. J., Shi, M., Medarde, M., Quintanilla, J., & Shiroka, T. (2020). Time-reversal symmetry breaking in the noncentrosymmetric Zr3Ir superconductor. Physical Review B, 102(2), [020503]. https://doi.org/10.1103/PhysRevB.102.020503