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APS » Journals » Phys. Rev. Lett. » Volume 64 » Issue 20
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Phys. Rev. Lett. 64, 2414–2417 (1990)

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

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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

Received 14 March 1990; published in the issue dated 14 May 1990

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.

© 1990 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.2414
DOI:
10.1103/PhysRevLett.64.2414
PACS:
61.12.-q, 61.60.+m, 74.70.Vy
 
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