期刊
PHYSICAL REVIEW B
卷 102, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.020503
关键词
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资金
- Schweizerische Nationalfonds zur Forderung der Wissenschaftlichen Forschung (SNF) [200021_169455, 206021_139082]
- EPSRC through the project Unconventional superconductors: New paradigms for new materials [EP/P00749X/1]
- MOST [104-2112-M006-010-MY3, 107-2112-M-006-020]
- EPSRC [EP/P00749X/1] Funding Source: UKRI
We report the discovery of Zr3Ir as a structurally different type of unconventional noncentrosymmetric superconductor (with T-c = 2.3 K), here investigated mostly via muon-spin rotation/relaxation (mu SR) techniques. Its superconductivity was characterized using magnetic susceptibility, electrical resistivity, and heat capacity measurements. The low-temperature superfluid density, determined via transverse-field mu SR and electronic specific heat, suggests a fully gapped superconducting state. The spontaneous magnetic fields, revealed by zero-field mu SR below T-c, 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.
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