Abstract
Structural properties of homogeneous orthorhombic and tetragonal ErBa{sub 2}Cu{sub 3}O{sub {ital x}} powder samples (6.1{le}{ital x}{le}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 2{ital q}(0,0,{ital z}) apex atoms O(1) move closer to the Cu-O-Cu chains. The copper-oxygen (1) distances do not vary continuously in the {ital z} direction but seem to change more rapidly when {ital x}{lt}6.5. The change of these distances can be correlated to the suppression of superconductivity in orthorhombic ErBa{sub 2}Cu{sub 3}O{sub {ital x}}. 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.
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