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We report point contact measurements in high quality single crystals ofCu0.2Bi2Se3. We observe three different kinds of spectra: (1)Andreev-reflection spectra, from which we infer a superconducting gap size of0.6mV; (2) spectra with a large gap which closes above Tc at about 10K; and (3)tunneling-like spectra with zero-bias conductance peaks. These tunnelingspectra show a very large gap of ~2meV (2Delta/KTc ~ 14).

Unconventional superconductivity in CuxBi2Se3