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Bulk superconducting phase with a full energy gap in the doped topological insulator Cu(x)Bi₂Se₃
M Kriener1, Kouji Segawa, Zhi Ren
1Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan.
Abstract:
The superconductivity recently found in the doped topological insulator Cu(x)Bi₂Se₃ 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 Cu(x)Bi₂Se₃. Also, the evaluated effective mass of 2.6m(e) (m(e) is the free electron mass) points to a large mass enhancement in this material.
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