Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc5Co4Si10 probed by muon-spin spectroscopy
A. Bhattacharyya, M. R. Lees, K. Panda, P. P. Ferreira, T. T. Dorini, Emilie Gaudry, L. T. F. Eleno, V. K. Anand, J. Sannigrahi, P. K. Biswas, R. Tripathi, D. T. Adroja
DOI 10.1103/PhysRevMaterials.6.064802 · Physical Review Materials
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Abstract
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 2Δ/kBTC=2.84(2). However, the zero-field muon-spin 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sc5Co4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | unknown |
| Sc5Co4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | unknown |
| Sc5Co4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | unknown |
| Sc5Co4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | unknown |
| Y5Os4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.1 | Pressure unresolved | unknown |
| Sc5Ir4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.6 | Pressure unresolved | unknown |
| Sc5Rh4Si10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure unresolved | unknown |
| CoSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure unresolved | unknown |
| Lu3Co4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure unresolved | unknown |
| NaCoxO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure unresolved | unknown |
| LaCoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure unresolved | unknown |
| Sc3CoC4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure unresolved | unknown |
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