Coexistence of stripes and superconductivity: T-c amplification in a superlattice of superconducting stripes

Here we report direct evidence for charge ordering in the oxygen doped La2C uO4.1 superconductor by x-ray diffraction using a third generation synchrot ron source. We observe 1D charge ordering and oxygen ordering in an optimal ly doped superconductor (T-c=40K) well beyond the phase separation regime. The order parameter of the anharmonic 1D CDW shows a critical behavior (T-c 0-T)(0.5) with T-co=190K. The oxygen ordering and the polaron 1D CDW with i ts associated orbital wave, realize a superlattice of quantum stripes with a wavevector that at the density of charge carriers, r(s)similar to6, in th e superconducting stripes satisfies the shape resonance condition for T-c a mplification.