Crystal structure and distortion of superconducting Cu${}_x$Bi${}_2$Se${}_3$

Abstract

The crystal structure of the candidate topological superconductor Cu${}_x$Bi${}_2$Se${}_3$ was studied by single-crystal neutron diffraction using samples obtained by inserting the Cu dopant electrochemically. Neither structural refinements nor calculated scattering-density maps find a significant occupation of Cu at the intercalation site between the quintuple layers of Bi${}_2$Se${}_3$. Following Bragg reflection intensities as function of temperature, there is no signature of a structural phase transition between 295 and 2 K. However, the analysis of large sets of Bragg reflections indicates a small structural distortion breaking the rotational axis due to small displacements of the Bi ions.

9 pages, 7 figures

References in corpus (3)

• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Electrochemical synthesis and superconducting phase diagram of Cu_xBi2Se3
• Nematic superconductivity in doped Bi2Se3 topological superconductors

Cited by in corpus (8)

• Phonon-driven ultrafast symmetry lowering in a Bi${}_2$Se${}_3$ crystal
• The Vertical Position of Sr Dopants in the Sr${}_x$Bi${}_2$Se${}_3$ Superconductor
• Breaking of Ginzburg-Landau description in the temperature dependence of the anisotropy in the nematic superconductor
• Topological transitions to Weyl states in bulk Bi${}_2$Se${}_3$: Effect of hydrostatic pressure and doping
• Strain induced spin vortex and Majorana Kramer's pairs in doped topological insulators with nematic superconductivity
• Shear Modulus Anomaly of Unconventional Superconductor in a Symmetry Breaking Field
• Interaction between spin and Abrikosov vortices in doped topological insulators
• Sensitivity of superconducting states to the impurity location in layered materials