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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.25: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU D

Four-Unit-Cell Superstructure in the Optimally Doped YBa2Cu3O6.92 Superconductor — •Z. Islam1, X. Liu2, S.K. Sinha2, J.C. Lang1, S.C. Moss3, D. Haskel1, G. Srajer1, P. Wochner4, D.R. Lee1, D.R. Haeffner1, and U. Welp51Advanced Photon Source, ANL, Argonne, USA — 2University of California, San Diego, USA — 3University of Houston, USA — 4MPI f. Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — 5Materials Science Division, ANL, Argonne, USA

Diffuse x-ray scattering measurements reveal that the optimally doped YBa2Cu3O6.92 superconductor is intrinsically modulated due to the formation of a kinetically limited 4-unit-cell superlattice, q0 = (1/4,0,0), along the shorter Cu-Cu bonds. Long-range strains emanating from these modulated regions generate an inhomogeneous lattice which may play a fundamentally important role in the electronic properties of yttrium-barium-copper-oxides.

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