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arXiv · 1704.06166

Multiband Superconductivity in the time reversal symmetry broken superconductor Re6Zr

Pradnya Parab·Deepak Singh·Harries Muthurajan·R. P. Singh·Pratap Raychaudhuri·Sangita Bose
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Abstract

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.

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Pradnya Parab, Deepak Singh, Harries Muthurajan, R. P. Singh, Pratap Raychaudhuri, Sangita Bose. 2017-04-20. Multiband Superconductivity in the time reversal symmetry broken superconductor Re6Zr. https://arxiv.org/abs/1704.06166

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