X-Ray-Diffraction Study of Charge-Density-Waves and Oxygen-Ordering in YBa2Cu3O6+x Superconductor

Abstract

We report a temperature-dependent increase below 300 K of diffuse superlattice peaks corresponding to q_0 =(~2/5,0,0) in an under-doped YBa_2Cu_3O_6+x superconductor (x~0.63). These peaks reveal strong c-axis correlations involving the CuO_2 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 CuO_2 planes coupled to the oxygen-vacancy ordering.

4 pages, 4 figures

References in corpus (1)

• Observation of Magnetic Moments in the Superconducting State of YBa${}_2$Cu${}_3$O${}_{6.6}$

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• Two and Three Dimensional Incommensurate Modulation in Optimally-Doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Charge-screening role of $c$-axis atomic displacements in YBa${}_2$Cu${}_3$O${}_{6+x}$ and related superconductors
• Quasiparticle dynamics and in-plane anisotropy in $YB{a}_{2}C{u}_3{O}_y$ system near onset of superconductivity
• Impact of chain fragmentation on charge transfer scenario and two-plateaus-like behavior of Tc(x) in YBa2Cu3O6+x
• High temperature superconductivity: Cooper pairs in trap
• Anomalous ordering in inhomogeneously strained materials