Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd

Details Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd

2012-02-11

arxiv.org/abs/1202.2454v2

Physics

Condensed Matter

Superconductivity

pdf file with figure (some corrections done, supplementary material added)

Scientific paper

We report directional point contact Andreev reflection (PCAR) measurements on high-quality single crystals of the non-centrosymmetric superconductor, BiPd. The PCAR spectra measured on different crystallographic faces of the single crystal clearly show the presence of multiple superconducting energy gaps. For point contacts with low resistance, in addition to the superconducting gap feature, a pronounced zero bias conductance peak is observed. These observations provide strong evidence of the presence of unconventional order parameter in this material.

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