Observation of a local structural change at Tc for Tl2Ba2CaCu2O8 by pulsed neutron diffraction

B. H. Toby, T. Egami, J. D. Jorgensen, and M. A. Subramanian
Phys. Rev. Lett. 64, 2414 – Published 14 May 1990
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Abstract

Deviations in atomic positions from those of the average crystallographic structure of superconducting Tl2ba2CaCu2O8 were studied by pair-distribution function (PDF) analysis of pulsed-neutron-scattering data. The PDF shows a clear change in the local structure at the onset of superconductivity. In addition to the previously observed local displacements of Tl and O within the Tl-O sheets, correlated displacements of O and Cu perpendicular to the Cu-O plane have been found. The arrangement of the O atoms appears to be different above and below Tc.

  • Received 14 March 1990

DOI:https://doi.org/10.1103/PhysRevLett.64.2414

©1990 American Physical Society

Authors & Affiliations

B. H. Toby and T. Egami

  • Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272

J. D. Jorgensen

  • Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

M. A. Subramanian

  • Central Research and Development Department, E. I. du Pont de Nemours Company, Experimental Station, Wilmington, Delaware 19898

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Vol. 64, Iss. 20 — 14 May 1990

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