X-Ray-Diffraction Study of Charge-Density-Waves and Oxygen-Ordering in YBa2Cu3O6+x Superconductor
Zahirul Islam, S. K. Sinha, D. Haskel, J. Lang, G. Srajer, D. R. Haeffner, B. W. Veal, H. A. Mook
Abstract
We report a temperature-dependent increase below 300 K of diffuse superlattice peaks corresponding to q0 =(~2/5,0,0) in an under-doped YBa2Cu3O6+x superconductor (x~0.63). These peaks reveal strong c-axis correlations involving the CuO2 bilayers, show a non-uniform increase below \~220 K with a plateau for ~100-160 K, and appear to saturate in the superconducting phase. We interpret this unconventional T-dependence of the ``oxygen-ordering'' peaks as a manifestation of a charge density wave in the CuO2 planes coupled to the oxygen-vacancy ordering.
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