Journal
PHYSICAL REVIEW B
Volume 86, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.064517
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Funding
- Israeli Science Foundation
- NSF [DMR-0084402]
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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 0.6 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).
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