Nodeless superconductivity in the noncentrosymmetric Mo3Rh2N superconductor: a μSR study
Abstract
The noncentrosymmetric superconductor Mo3Rh2N, with Tc = 4.6 K, adopts a β-Mn-type structure (space group P4132), similar to that of Mo3Al2C. Its bulk superconductivity was characterized by magnetization and heat-capacity measurements, while its microscopic electronic properties were investigated by means of muon-spin rotation and relaxation (μSR). The low-temperature superfluid density, measured via transverse-field (TF)-μSR, evidences a fully-gapped superconducting state with 0 = 1.73 kBTc, very close to 1.76 kBTc - the BCS gap value for the weak coupling case, and a magnetic penetration depth λ0 = 586 nm. The absence of spontaneous magnetic fields below the onset of superconductivity, as determined by zero-field (ZF)-μSR measurements, hints at a preserved time-reversal symmetry in the superconducting state. Both TF-and ZF-μSR results evidence a spin-singlet pairing in Mo3Rh2N.
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