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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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WRAP-Nodeless-time-reversal-symmetry-breaking-in-the-centrosymmetric-superconductor-Sc5Co4Si10-probed-by-muon-spin-spectroscopy-Lees-22.pdf - Published Version - Requires a PDF viewer. Download (2426Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevMaterials.6.06480...
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 | ||||||||||||||||||||||||
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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: |
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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: |
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