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

We perform a point-contact Andreev reflection spectroscopic study of the topological superconducting material, Cu0.25Bi2Se3, in the ballistic regime using a normal-metal gold tip. We observe distinct point-contact spectra on the superconducting and non-superconducting regions of the crystal surface: the former shows a marked zero-bias conductance peak, indicative of unconventional superconductivity, while the latter exhibits a pseudogap-like feature. In both cases the measured differential conductance spectra exhibit a large linear background, preventing direct quantitative comparison with theory. We attribute this background to inelastic scattering at the tip-sample interface, and compare the background-subtracted spectra with a single-band p-wave model.

preprint2012arXivOpen access
X. ChenC. HuanY. S. HorC. A. R. Sá de MeloZ. Jiang
cond-mat.supr-con
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X. ChenC. HuanY. S. HorC. A. R. Sá de MeloZ. Jiang

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