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Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr

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arxiv 1401.2108 v2 pith:HSLJZWZH submitted 2014-01-09 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr

R. P. Singh , A. D. Hillier , B. Mazidian , J. Quintanilla , J. F. Annett , D. McK. Paul , G. Balakrishnan , M. R. Lees This is my paper
classification cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el
keywords superconductingmusrre6zrsymmetrytime-reversalbreakingnon-centrosymmetricpairing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have investigated the superconducting state of the non-centrosymmetric compound Re6Zr using magnetization, heat capacity, and muon-spin relaxation/rotation (muSR) measurements. Re6Zr has a superconducting transition temperature, Tc = 6.75 K. Transverse-field muSR experiments, used to probe the superfluid density, suggest an s-wave character for the superconducting gap. However, zero and longitudinal-field muSR 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.

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