Bulk superconducting phase with a full energy gap in the doped topological insulator CuxBi2Se3
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.
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