Crystal structure and distortion of superconducting Cu$_x$Bi$_2$Se$_{3}$

Tobias Fröhlich; Zhiwei Wang; Mahasweta Bagchi; Anne Stunault; Yoichi Ando; Markus Braden

doi:10.1103/PhysRevMaterials.4.054802

Crystal structure and distortion of superconducting Cu$_x$Bi$_2$Se$_{3}$

Superconductivity 2022-03-24 v1

Authors: Tobias Fröhlich , Zhiwei Wang , Mahasweta Bagchi , Anne Stunault , Yoichi Ando , Markus Braden

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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.

Keywords

topological superconductor cu_bi_se single-crystal neutron diffraction structural distortion intercalation site bragg reflections

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@article{arxiv.2004.10553,
  title  = {Crystal structure and distortion of superconducting Cu$_x$Bi$_2$Se$_{3}$},
  author = {Tobias Fröhlich and Zhiwei Wang and Mahasweta Bagchi and Anne Stunault and Yoichi Ando and Markus Braden},
  journal= {arXiv preprint arXiv:2004.10553},
  year   = {2022}
}

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9 pages, 7 figures

Crystal structure and distortion of superconducting Cu$_x$Bi$_2$Se$_{3}$

Abstract

Keywords

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