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Unconventional superconductivity in CuxBi2Se3

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arxiv 1111.5805 v2 pith:K2KK3KDX submitted 2011-11-24 cond-mat.supr-con cond-mat.str-el

T. Kirzhner , E. Lahoud , K. B. Chaska , Z. Salman , A. Kanigel This is my paper
classification cond-mat.supr-concond-mat.str-el
keywords spectralargeaboveandreev-reflectionbi2se3closesconductancecontact
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We report point contact measurements in high quality single crystals of Cu0.2Bi2Se3. We observe three different kinds of spectra: (1) Andreev-reflection spectra, from which we infer a superconducting gap size of 0.6mV; (2) spectra with a large gap which closes above Tc at about 10K; and (3) tunneling-like spectra with zero-bias conductance peaks. These tunneling spectra show a very large gap of ~2meV (2Delta/KTc ~ 14).

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