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 YBa₂Cu₃O_6.92 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. Welp⁵ — ¹Advanced 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 YBa₂Cu₃O_6.92 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.