Charge ordering in La1.8-xEu0.2SrxCuO4 studied by resonant soft x-ray diffraction

Resonant soft x-ray scattering with photon energies near the O K and the Cu L-3 edges was used to study the charge ordering in the system La1.8-xEu0.2SrxCuO4 as a function of temperature for x=0.125 and 0.15. From the superstructure diffraction intensities, a charge ordering with a doping-dependent wave vector is derived which is in this system well below the transition temperature of the low-temperature tetragonal phase but well above the onset of spin ordering. This indicates that structural changes and magnetic interactions are not in general the driving force for the formation of stripelike phases in two-dimensional-doped cuprates. Analysis of the lineshape of the scattered intensity as a function of photon energy yields evidence for a high hole concentration in the stripes.