Andreev bound state and multiple energy gaps in the noncentrosymmetric superconductor BiPd
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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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