Bulk Superconducting Phase with a Full Energy Gap in the Doped Topological Insulator CuxBi2Se3
M. Kriener, Kouji Segawa, Zhi Ren, Satoshi Sasaki, Yoichi Ando
DOI 10.1103/PhysRevLett.106.127004 · Physical Review Letters
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Abstract
The superconductivity recently found in the doped topological insulator CuxBi2Se3 offers a great opportunity to search for a topological superconductor. We have successfully prepared a single-crystal sample with a large shielding fraction and measured the specific-heat anomaly associated with the superconductivity. The temperature dependence of the specific heat suggests a fully gapped, strong-coupling superconducting state, but the BCS theory is not in full agreement with the data, which hints at a possible unconventional pairing in CuxBi2Se3. Also, the evaluated effective mass of 2.6me (me is the free electron mass) points to a large mass enhancement in this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CuxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| Cu0.29Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.6 | Pressure not reported | onset |
| Cu0.29Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | zero_resistance |
| Cu0.29Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | onset |
| Cu0.29Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | midpoint |
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