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Time-reversal symmetry breaking in re-based superconductors
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Shang, T., Smidman, M., Ghosh, S. K., Baines, C., Chang, L. J., Gawryluk, D. J., Barker, J. A. T., Singh, R. P., Paul, Don McK., Balakrishnan, Geetha, Pomjakushina, E., Shi, M., Medarde, M., Hillier, A. D., Yuan, H. Q., Quintanilla, J., Mesot, J. and Shiroka, T. (2018) Time-reversal symmetry breaking in re-based superconductors. Physical Review Letters, 121 (25). 257002. doi:10.1103/PhysRevLett.121.257002 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.121.257002
Abstract
To trace the origin of time-reversal symmetry breaking (TRSB) in Re-based superconductors, we performed comparative muon-spin rotation and relaxation (μSR) studies of superconducting noncentrosymmetric Re0.82Nb0.18 (Tc = 8.8 K) and centrosymmetric Re (Tc = 2.7 K). In Re0.82Nb0.18, the low–temperature superfluid density and the electronic specific heat evidence a fully gapped superconducting state, whose enhanced gap magnitude and specific-heat discontinuity suggest a moderately strong electron phonon coupling. In both Re0.82Nb0.18 and pure Re, the spontaneous magnetic fields revealed by zero-field μSR below Tc indicate time-reversal symmetry breaking and thus unconventional superconductivity. The concomitant occurrence of TRSB in centrosymmetric Re and noncentrosymmetric ReT (T = transition metal), yet its preservation in the isostructural noncentrosymmetric superconductors Mg10Ir19B16 and Nb0.5Os0.5, strongly suggests that the local electronic structure of Re is crucial for understanding the TRSB superconducting state in Re and ReT. We discuss the superconducting order parameter symmetries that are compatible with the experimental observations.
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): | Superconductors, Electron-phonon interactions, Time reversal | ||||||||||||||||||||||||||||||
Journal or Publication Title: | Physical Review Letters | ||||||||||||||||||||||||||||||
Publisher: | American Physical Society | ||||||||||||||||||||||||||||||
ISSN: | 0031-9007 | ||||||||||||||||||||||||||||||
Official Date: | 21 December 2018 | ||||||||||||||||||||||||||||||
Dates: |
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Volume: | 121 | ||||||||||||||||||||||||||||||
Number: | 25 | ||||||||||||||||||||||||||||||
Article Number: | 257002 | ||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevLett.121.257002 | ||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | © 2018 American Physical Society | ||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||
Copyright Holders: | American Physical Society | ||||||||||||||||||||||||||||||
Date of first compliant deposit: | 2 January 2019 | ||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 3 January 2019 | ||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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