Point-contact spectroscopy of Cu0.2Bi2Se3 single crystals
Point-contact spectroscopy of Cu0.2Bi2Se3 single crystals
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DOI:
10.1103/physrevb.86.064517
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发表时间:
2012-08-16
影响因子:
3.7
通讯作者:
Kanigel, A.
中科院分区:
文献类型:
--
作者:
Kirzhner, T.;Lahoud, E.;Kanigel, A.
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 0.6 mV; (2) spectra with a large gap which closes above T-c at about 10 K; and (3) tunnelinglike spectra with zero-bias conductance peaks. These tunneling spectra show a very large gap of similar to 2 meV (2 Delta/KbTc similar to 14).