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Article Dans Une Revue Physical Review Materials Année : 2022

Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc5Co4Si10 probed by muon-spin spectroscopy

Résumé

We investigate the superconducting properties of Sc5Co4Si10 using low-temperature resistivity, magnetization, heat capacity, and muon-spin rotation and relaxation (μSR) measurements. We find that Sc5Co4Si10 exhibits type-II superconductivity with a superconducting transition temperature TC = 3.5(1) K. The temperature dependence of the superfluid density obtained from transverse-field μSR spectra is best modeled using an isotropic Bardeen-Cooper-Schrieffer type s-wave gap symmetry with 2/kBTC = 2.84(2). However, the zero-field muonspin relaxation rate reveals the appearance of a spontaneous magnetic field below TC, indicating that time-reversal symmetry (TRS) is broken in the superconducting state. Although this behavior is commonly associated with nonunitary or mixed singlet-triplet pairing, our group-theoretical analysis of the Ginzburg-Landau free energy alongside density functional theory calculations indicates that unconventional mechanisms are pretty unlikely. Therefore, we have hypothesized that TRS breaking may occur via a conventional electron-phonon process.
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hal-04102018 , version 1 (22-05-2023)

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Amitava Bhattacharyya, Martin R. Lees, Kartik Panda, Pedro Pires Ferreira, Thiago Trevizam Dorini, et al.. Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc5Co4Si10 probed by muon-spin spectroscopy. Physical Review Materials, 2022, 6 (6), pp.064802. ⟨10.1103/PhysRevMaterials.6.064802⟩. ⟨hal-04102018⟩
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