Crystal structure and distortion of superconducting CuxBi2Se3

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

doi:10.1103/PhysRevMaterials.4.054802

Crystal structure and distortion of superconducting CuxBi2Se3

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

School of Physics

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

The crystal structure of the candidate topological superconductor CuxBi2Se3 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 Bi2Se3. Following Bragg reflection intensities as a 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.

Original language	English
Article number	054802
Journal	Physical Review Materials
Volume	4
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevMaterials.4.054802
Publication status	Published - May 2020

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10.1103/PhysRevMaterials.4.054802

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Fröhlich, T., Wang, Z., Bagchi, M., Stunault, A., Ando, Y., & Braden, M. (2020). Crystal structure and distortion of superconducting CuxBi2Se3. Physical Review Materials, 4(5), Article 054802. https://doi.org/10.1103/PhysRevMaterials.4.054802

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abstract = "The crystal structure of the candidate topological superconductor CuxBi2Se3 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 Bi2Se3. Following Bragg reflection intensities as a 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.",

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AU - Fröhlich, Tobias

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AU - Stunault, Anne

AU - Ando, Yoichi

AU - Braden, Markus

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AB - The crystal structure of the candidate topological superconductor CuxBi2Se3 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 Bi2Se3. Following Bragg reflection intensities as a 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.

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Crystal structure and distortion of superconducting CuxBi2Se3

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