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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

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.121.257002

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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
Subjects: Q Science > QC Physics
Divisions: Faculty of 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:
DateEvent
21 December 2018Published
21 December 2018Accepted
30 July 2018Modified
11 March 2018Submitted
Volume: 121
Number: 25
Article Number: 257002
DOI: 10.1103/PhysRevLett.121.257002
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: © 2018 American Physical Society
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
11874320[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
11474251[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
2017YFA0303100National Key R&D Program of ChinaUNSPECIFIED
2016YFA0300202National Key R&D Program of ChinaUNSPECIFIED
UNSPECIFIED[MEPRC] Ministry of Education of the People's Republic of Chinahttp://dx.doi.org/10.13039/501100002338
20021-169455[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
206021- 139082[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
EP/M028771/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P00749X/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

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