Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3

Details Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3 Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3

2011-08-09

arxiv.org/abs/1108.1887v1

Phys. Rev. B 84, 054513 (2011)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.054513

The superconducting Cu_xBi_2Se_3 is an electron-doped topological insulator and is a prime candidate of the topological superconductor which still awaits discovery. The electrochemical intercalation technique for synthesizing Cu_xBi2Se3 offers good control of restricting Cu into the van-der-Waals gap and yields samples with shielding fractions of up to ~50%. We report essential details of this synthesis technique and present the established superconducting phase diagram of T_c vs x, along with a diagram of the shielding fraction vs x. Intriguingly, those diagrams suggest that there is a tendency to spontaneously form small islands of optimum superconductor in this material.

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