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We perform a point-contact Andreev reflection spectroscopic study of thetopological superconducting material, Cu0.25Bi2Se3, in the ballistic regimeusing a normal-metal gold tip. We observe distinct point-contact spectra on thesuperconducting and non-superconducting regions of the crystal surface: theformer shows a marked zero-bias conductance peak, indicative of unconventionalsuperconductivity, while the latter exhibits a pseudogap-like feature. In bothcases the measured differential conductance spectra exhibit a large linearbackground, preventing direct quantitative comparison with theory. We attributethis background to inelastic scattering at the tip-sample interface, andcompare the background-subtracted spectra with a single-band p-wave model.

Point-contact Andreev reflection spectroscopy of candidate topological superconductor Cu0.25Bi2Se3