Neutron-diffraction study of ErBa2Cu3Ox in the composition range 6.1≤x≤7.0

B. Rupp, E. Pörschke, P. Meuffels, P. Fischer, and P. Allenspach
Phys. Rev. B 40, 4472 – Published 1 September 1989
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Abstract

Structural properties of homogeneous orthorhombic and tetragonal ErBa2Cu3Ox powder samples (6.1≤x≤7.0), prepared by a careful absorption-desorption procedure, were investigated by elastic neutron scattering. With decreasing oxygen content the distance between Cu(2)-O(2,3) planes and Cu(1)-O(4)-Cu(1) chains increases and the oxygen 2q(0,0,z) apex atoms O(1) move closer to the Cu-O-Cu chains. The copper-oxygen (1) distances do not vary continuously in the z direction but seem to change more rapidly when x<6.5. The change of these distances can be correlated to the suppression of superconductivity in orthorhombic ErBa2Cu3Ox. A distinction between the large anisotropic vibrational amplitudes of the Cu(1)-O(4)-Cu(1) broken-chain oxygen atoms and a split-site model for O(4) is not possible on the basis of the present data.

  • Received 20 March 1989

DOI:https://doi.org/10.1103/PhysRevB.40.4472

©1989 American Physical Society

Authors & Affiliations

B. Rupp

  • Institut für Festkörperforschung, Kernforschungsanlage Jülich G.m.b.H., D-5170 Jülich, Federal Republic of Germany
  • Labor für Neutronenstreuung, Eidgenössische Technische Hochschule Zürich, Paul Scherrer Institut CH-5232 Villigen, Switzerland

E. Pörschke and P. Meuffels

  • Institut für Festkörperforschung, Kernforschungsanlage Jülich G.m.b.H., D-5170 Jülich, Federal Republic of Germany

P. Fischer and P. Allenspach

  • Labor für Neutronenstreuung, Eidgenössische Technische Hochschule Zürich, Paul Scherrer Institut CH-5232 Villigen, Switzerland

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Vol. 40, Iss. 7 — 1 September 1989

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