Multiband Superconductivity in the time reversal symmetry broken superconductor Re6Zr

We report point contact Andreev Reflection (PCAR) measurements on a high-quality single crystal of the non-centrosymmetric superconductor Re6Zr. We observe that the PCAR spectra can be fitted by taking two isotropic superconducting gaps with Delta_1 ~ 0.79 meV and Delta_2 ~ 0.22 meV respectively, su...

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Bibliographic Details
Published in:arXiv.org 2017-04
Main Authors: Parab, Pradnya, Singh, Deepak, Harries Muthurajan, Singh, R P, Raychaudhuri, Pratap, Bose, Sangita
Format: Article
Language:English
Subjects:
Atomic energy levels
Broken symmetry
Muon spin relaxation
Point contact
Single crystals
Superconductivity
Symmetry
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Summary:We report point contact Andreev Reflection (PCAR) measurements on a high-quality single crystal of the non-centrosymmetric superconductor Re6Zr. We observe that the PCAR spectra can be fitted by taking two isotropic superconducting gaps with Delta_1 ~ 0.79 meV and Delta_2 ~ 0.22 meV respectively, suggesting that there are at least two bands which contribute to superconductivity. Combined with the observation of time reversal symmetry breaking at the superconducting transition from muon spin relaxation measurements (Phys. Rev. Lett. 112, 107002 (2014)), our results imply an unconventional superconducting order in this compound: A multiband singlet state that breaks time reversal symmetry or a triplet state dominated by interband pairing.
ISSN:2331-8422