Observation of Ortho-III correlations by neutron and hard x-ray scattering in an untwinned YBa2Cu3O6.77 single crystal

P. Schleger, H. Casalta, R. Hadfield, H.F. Poulsen, M. von Zimmermann, N.H. Andersen, J.R. Schneider, R.X. Liang, P. Dosanjh, W.N. Hardy

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    We present measurements of Ortho-III phase correlations in an untwinned single crystal of YBa2Cu3O6.77 by neutron scattering and the novel method of hard (95 keV) X-ray scattering. The Ortho-III ordering is essentially two-dimensional, exhibiting Lorentzian peak shapes in the a-b plane. At room temperature, the correlation lengths deduced from the Lorentzian peak widths are about 5 unit cells (congruent-to 20 angstrom) along h and 19 unit cells (congruent-to 74 angstrom) along k, and are comparable to some correlation lengths measured for the Ortho-II phase. Upon heating, the superstructure intensity was found to decrease rapidly at temperatures above 50-degrees-C with about 10% of the original intensity remaining at 100-degrees-C and completely vanishing above 150-degrees-C. Such a low transition temperature explains why this phase is more difficult to observe than other superstructures, such as the Ortho-II.
    Original languageEnglish
    JournalPhysica C: Superconductivity and its Applications
    Issue number1-2
    Pages (from-to)103-110
    Publication statusPublished - 1995

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