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We present an x-ray diffraction study of the Vanadium-doped blue bronzeK0.3(Mo0.972V0.028)O3. At low temperature, we have observed both an intensityasymmetry of the +-2kF satellite reflections relative to the pure compound, anda profile asymmetry of each satellite reflections. We show that the profileasymmetry is due to Friedel oscillation around the V substituant and that theintensity asymmetry is related to the charge density wave (CDW) pinning. Thesetwo effects, intensity and profile asymmetries, gives for the first time accessto the local properties of CDW in disordered systems, including the pinning andeven the phase shift of FOs.Comment: 4 pages REVTEX, 5 figure

Friedel oscillations and charge-density wave pinning in quasi-one-dimensional conductors: An x-ray diffraction study