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Unconventional superconductivity in La7Ir3 revealed by muon spin relaxation : introducing a new family of noncentrosymmetric superconductor that breaks time-reversal symmetry

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Barker, Joel, Singh, D., Singh, R. P., Thamizhavel, A., Hillier, A. D. (Adrian D.), Lees, Martin R., Balakrishnan, Geetha and Paul, Don McK. (2015) Unconventional superconductivity in La7Ir3 revealed by muon spin relaxation : introducing a new family of noncentrosymmetric superconductor that breaks time-reversal symmetry. Physical Review Letters, 115 . 267001. doi:10.1103/PhysRevLett.115.267001 ISSN 0031-9007.

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Official URL: https://doi.org/10.1103/PhysRevLett.115.267001

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Abstract

The superconductivity of the noncentrosymmetric compound La7Ir3 has been investigated using muon spin rotation and relaxation (μSR). Zero-field measurements reveal the presence of spontaneous static or quasi-static magnetic fields below the superconducting transition temperature Tc = 2:25 K - a clear indication that the superconducting state breaks time-reversal symmetry. Furthermore, transverse-field rotation measurements suggest that the superconducting gap is isotropic, and that the pairing symmetry of the superconducting electrons is predominantly s-wave with an enhanced binding strength. The results indicate that the superconductivity in La7Ir3 may be unconventional, and paves the way for further studies of this family of materials.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Superconductivity., Physics.
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 30 December 2015
Dates:
DateEvent
30 December 2015Published
30 December 2015Accepted
Volume: 115
Article Number: 267001
DOI: 10.1103/PhysRevLett.115.267001
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: 19 April 2017
Date of first compliant Open Access: 21 April 2017
Funder: ISIS Science and Technology Facilities Council, Science and Engineering Research Board, Engineering and Physical Sciences Research Council (EPSRC)
Grant number: ST/K502418/1, SR/S2/RJN-83/2012, EP/I007210/1

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