Evidence of fully-gapped superconductivity in NbReSi: A combined $\mu$SR and NMR study

Abstract

We report a comprehensive study of the noncentrosymmetric NbReSi superconductor by means of muon-spin rotation and relaxation ($\mu$SR) and nuclear magnetic resonance (NMR) techniques. NbReSi is a bulk superconductor with $T_c=6.5$ K, characterized by a large upper critical field, which exceeds the Pauli limit. Both the superfluid density ${\rho }_{\mathrm{sc}}(T)$ (determined via transverse-field $\mu$SR) and the spin-lattice relaxation rate $T_1^{-1}(T)$ (determined via NMR) suggest a nodeless superconductivity (SC) in NbReSi. We also find signatures of multigap SC, here evidenced by the field-dependent muon-spin relaxation rate and the electronic specific-heat coefficient. The absence of spontaneous magnetic fields below $T_c$, as evinced from zero-field $\mu$SR measurements, indicates a preserved time-reversal symmetry in the superconducting state of NbReSi. Finally, we discuss possible reasons for the unusually large upper critical field of NbReSi, most likely arising from its anisotropic crystal structure.

arXiv comment9 pages, 7 figures; accepted by Phys. Rev. B

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• Correlation stabilized ferromagnetic MnRuAs with distorted kagome lattice
• Multiband superconductivity in the topological Kramers nodal-line semimetals
• Fully-gapped superconducting state in interstitial-carbon-doped Zr5Pt3
• Thermodynamic parameters of atomically thin superconductors derived from the upper critical field
• Comment on "Fully gapped superconductivity and topological aspects of the noncentrosymmetric superconductor TaReSi"
• Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr${}_2$B${}_2$
• First-principles evidence for conventional superconductivity in a quasicrystal approximant