| Full text | |
| Author(s): Show less - |
Bhattacharyya, A.
;
Lees, M. R.
;
Panda, K.
;
Ferreira, P. P.
;
Dorini, T. T.
;
Gaudry, Emilie
;
Eleno, L. T. F.
;
Anand, V. K.
;
Sannigrahi, J.
;
Biswas, P. K.
;
Tripathi, R.
;
Adroja, D. T.
Total Authors: 12
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW MATERIALS; v. 6, n. 6, p. 10-pg., 2022-06-15. |
| Abstract | |
We investigate the superconducting properties of Sc5Co4Si10 using low-temperature resistivity, magnetization, heat capacity, and muon-spin rotation and relaxation (mu SR) measurements. We find that Sc5Co4Si10 exhibits type-II superconductivity with a superconducting transition temperature T-C = 3.5(1)K. The temperature dependence of the superfluid density obtained from transverse-field mu SR spectra is best modeled using an isotropic Bardeen-Cooper-Schrieffer type s-wave gap symmetry with 2 Delta/k(B)T(C) = 2.84(2). However, the zero-field muon-spin relaxation rate reveals the appearance of a spontaneous magnetic field below T-C, 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. (AU) | |
| FAPESP's process: | 20/08258-0 - Ab initio study of superconducting and topological systems |
| Grantee: | Pedro Nunes Ferreira |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 19/05005-7 - Computational Materials Laboratory for the ab initio study of the stability of intermetallic compounds |
| Grantee: | Luiz Tadeu Fernandes Eleno |
| Support Opportunities: | Regular Research Grants |