Bulk Superconducting Phase with a Full Energy Gap in the Doped Topological Insulator CuxBi2Se3
Bulk Superconducting Phase with a Full Energy Gap in the Doped Topological Insulator CuxBi2Se3
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DOI：
10.1103/physrevlett.106.127004
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发表时间：
2011-03-23
影响因子：
8.6
通讯作者：
Ando, Yoichi
中科院分区：
文献类型：
--
作者：
Kriener, M.;Segawa, Kouji;Ando, Yoichi
最近在掺杂拓扑绝缘体CuxBi_2Se_3中发现的超导性为寻找拓扑超导体提供了一个很好的机会。我们已经成功地制备了一个具有大屏蔽分数的单晶样品，并测量了与超导性相关的比热异常。比热的温度依赖性表明了一个完全带隙的强耦合超导态，但BCS理论与数据并不完全一致，这暗示了CuxBi2Se3中可能存在非常规配对。此外，2.6 m（e）（m（e）是自由电子质量）的评估有效质量表明该材料的质量增强很大。
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 2.6m(e) (m(e) is the free electron mass) points to a large mass enhancement in this material.