Friedel oscillation and charge density wave pinning in vanadium-doped blue bronze

2002 ◽  
Vol 12 (9) ◽  
pp. 79-80
Author(s):  
S. Ravy ◽  
S. Rouziere ◽  
E. Elkaïm ◽  
J.-P. Pouget ◽  
S. Brazovskii
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
Friedel Oscillations ◽  
Friedel Oscillation ◽  
Blue Bronze

An analysis of x-ray data from vanadium-doped blue bronze K0.3(Mo1-xVx)O3 is presented for x=2.8% and 1.44%. 2kF satellite reflections are broadened in all the directions and exhibit a peculiar profile asymmetry in the chain direction We interpret this profile asymmetry by the presence of Friedel oscillations around the charged vanadium impurities.

Friedel oscillations and charge density wave pinning in quasi-one dimensional conductors: Thermal effects

2002 ◽  
Vol 12 (9) ◽  
pp. 9-14
Author(s):  
J.-P. Pouget ◽  
S. Ravy ◽  
S. Rouziere ◽  
S. Brazovskii
Keyword(s):  
Charge Density ◽  
Interference Effect ◽  
Charge Density Wave ◽  
Density Wave ◽  
Thermal Dependence ◽  
One Dimensional ◽  
X Ray ◽  
Friedel Oscillations ◽  
X Ray Scattering ◽  
Ray Scattering

An original interference effect observed in one-dimensional (1D) disordered conductors between X-ray scattering due to the disorder and the charge density wave (CDW)- periodic lattice modulation (PLD) allows to study the pinning of the modulation at local scale. We apply this effect to determine the phase of the CDW at the pinning centres and to show that the response of the CDW to the impurity potential leads to the formation of Friedel oscillations (FO). We report experimental determination and quantitative interpretation of the thermal evolution of both features. The thermal dependence of the interference effect allows one to determine the pinning energy of the 2kF-CDW in the V-and W-doped blue bronzes. We show in particular that in these compounds the regular CDW is pinned to the dopant dressed by its FO. In the organic charge transfer salts irradiation leads to an enhancement of the 2kF and 4kF X-ray scattering that we show, by its thermal dependence, to be due to the formation of FO.

X-ray investigation of charge-density-wave pinning in blue bronze

1991 ◽  
Vol 66 (15) ◽  
pp. 2026-2029 ◽  
Author(s):  
Sharon M. DeLand ◽  
George Mozurkewich ◽  
L. D. Chapman
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
X Ray ◽  
Blue Bronze

X-ray intensity fluctuation spectroscopy measurements of the charge density wave phases of NbSe3

2002 ◽  
Vol 12 (9) ◽  
pp. 3-8
Author(s):  
M. Sutton ◽  
Y. Li ◽  
J. D. Brock ◽  
R. E. Thorne
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Intensity Fluctuation ◽  
Speckle Pattern ◽  
Equations Of Motion ◽  
Density Wave ◽  
Electrical Currents ◽  
X Ray ◽  
Longitudinal Correlation ◽  
Speckle Patterns

An introduction to X-ray Intensity Fluctuation Spectroscopy (XIFS) is given by describing its relationship to speckle from coherent sources. A brief description of the relationship of XIFS measurements to the underlying equations of motion is given. Preliminary results for the charge density wave (CDW) system NbSe3 are then presented. Static speckle patterns are shown for the $\overrightarrow {Q}_1 = (0 .76$ 0) CDW peak showing that XIFS experiments are possible in this systom provided time constants are long enough. For electrical currents below threshold, a static speckle pattern is observed but for currents above threshold the speckles are smeared out showing movement of the CDW. It is also shown that above threshold, the longitudinal correlation length decreases.

A single charge density wave dislocation observed by coherent X-ray diffraction

2005 ◽  
Vol 131 ◽  
pp. 143-146
Author(s):  
D. le Bolloc'h ◽  
S. Ravy ◽  
J. Dumas ◽  
J. Marcus ◽  
F. Livet ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Single Charge ◽  
X Ray Diffraction ◽  
X Ray
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