Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3

Details Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3 Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3

2011-03-24

arxiv.org/abs/1103.4750v1

Phys. Rev. Lett. 106, 127004 (2011)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.106.127004

The superconductivity recently found in the doped topological insulator Cu_xBi_2Se_3 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_xBi_2Se_3. 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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