期刊
PHYSICAL REVIEW B
卷 79, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.100502
关键词
charge-ordered states; doping; europium compounds; high-temperature superconductors; hole density; lanthanum compounds; strontium compounds; superconducting transition temperature; X-ray diffraction; X-ray scattering
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.
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