X-Ray Diffraction from Pinned Charge Density Waves
S. Rouziere, S. Ravy, S. Brazovskii, J. -P. Pouget
Abstract
We present an x-ray study of doped charge density waves systems. When a 2kf-charge density wave is strongly pinned to impurities, an interference effect gives rise to an asymmetry between the intensities of the +2kf and -2kf satellite reflections. Moreover, profile asymmetry of the satellite reflections indicates the existence of Friedel oscillations (FOs) around the defects. We have studied these effects in V- and W-doped blue bronzes. A syncrotron radiation study of the V-doped blue bronze clearly reveals the presence of FO around the V atoms.
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