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Detection of time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Zr using muon-spin spectroscopy

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Singh, R. P., Hillier, A. D. (Adrian D.), Mazidian, B., Quintanilla, J., Annett, J. F., Paul, Don McK., Balakrishnan, Geetha and Lees, Martin R. (2014) Detection of time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Zr using muon-spin spectroscopy. Physical Review Letters, 112 (10). 107002. doi:10.1103/PhysRevLett.112.107002

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.112.107002

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Abstract

We have investigated the superconducting state of the noncentrosymmetric compound Re6Zr using magnetization, heat capacity, and muon-spin relaxation or rotation (μSR) measurements. Re6Zr has a superconducting transition temperature, Tc=6.75±0.05  K. Transverse-field μSR experiments, used to probe the superfluid density, suggest an s-wave character for the superconducting gap. However, zero and longitudinal-field μSR data reveal the presence of spontaneous static magnetic fields below Tc indicating that time-reversal symmetry is broken in the superconducting state and an unconventional pairing mechanism. An analysis of the pairing symmetries identifies the ground states compatible with time-reversal symmetry breaking.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 13 March 2014
Dates:
DateEvent
13 March 2014Published
Volume: 112
Number: 10
Article Number: 107002
DOI: 10.1103/PhysRevLett.112.107002
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
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