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