Upper critical field of the noncentrosymmetric superconductor BiPd
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The superconducting parameters and upper critical field of the noncentrosymmetric superconductor BiPd have proven contentious. This material is of particular interest because it is a singular example of a 4 f-electron-free noncentrosymmetric superconductor of which crystals may be grown and cleaved, enabling surface-sensitive spectroscopies. Here, using bulk probes augmented by tunnelling data on defects, we establish that the lower of the previously reported upper critical fields corresponds to the bulk transition. The material behaves as a nearly-weak-coupled BCS s-wave superconductor, and we report its superconducting parameters as drawn from the bulk upper critical field. Possible reasons behind the order-of-magnitude discrepancy in the reported upper critical fields are discussed.
Peets , D , Maldonado Cid , A I , Enayat , M , Sun , Z , Wahl , P & Schnyder , A 2016 , ' Upper critical field of the noncentrosymmetric superconductor BiPd ' Physical Review. B, Condensed matter and materials physics , vol. 93 , no. 17 , 174504 . https://doi.org/10.1103/PhysRevB.93.174504
Physical Review. B, Condensed matter and materials physics
© 2016, American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at journals.aps.org / https://dx.doi.org/10.1103/PhysRevB.93.174504
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