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

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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. and Adroja, D. T. (2022) Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc5Co4Si10 probed by muon-spin spectroscopy. Physical Review Materials, 6 (6). 064802. doi:10.1103/PhysRevMaterials.6.064802 ISSN 2475-9953.

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Official URL: http://dx.doi.org/10.1103/PhysRevMaterials.6.06480...

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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 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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Rare earths , Rare earths -- Magnetic properties, Superconductivity, Superconductors, Type II , Muon spin rotation , Electron-phonon interactions
Journal or Publication Title: Physical Review Materials
Publisher: American Physical Society
ISSN: 2475-9953
Official Date: 15 June 2022
Dates:
DateEvent
15 June 2022Published
18 May 2022Accepted
28 February 2022Submitted
Volume: 6
Number: 6
Article Number: 064802
DOI: 10.1103/PhysRevMaterials.6.064802
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
Date of first compliant deposit: 27 June 2022
Date of first compliant Open Access: 28 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
CRG/2020/000698Science and Engineering Research Boardhttp://dx.doi.org/10.13039/501100001843
EP/W00562X/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIED[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
IF170620 India. Department of Science and Technologyhttp://viaf.org/viaf/139476328
001Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorhttp://dx.doi.org/10.13039/501100002322
2019/05005-7Fundação de Amparo à Pesquisa do Estado de São Paulohttp://dx.doi.org/10.13039/501100001807
2020/08258-0Fundação de Amparo à Pesquisa do Estado de São Paulohttp://dx.doi.org/10.13039/501100001807
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