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Etude des propriétés mésoscopiques dans les systèmes quasi-unidimensionnels à onde de densité de charge

Abstract : We studied the transport properties of the charge density waves of the quasi-one-dimensional conductor NbSe3, at micron and submicron scale (down to 300 nm) and at low temperature (down to 4 K). We have developed a clean room process for microfabrication of charge density wave devices electrically connected by ohmic contacts. This allowed us to perform experiments on the effect of a force transverse to the motion of a charge density wave, we showed that the reduction of the threshold depinning field mentioned previously by another group was related to current injection inhomogeneity instead of an enhancement of the spatial coherence of the condensate. We also studied the influence of the microfabrication such as constrictions or etching on the properties of the samples, like the depinning field or transition temperature. Moreover, we carried out coupled transport / high resolution X-ray experiments at ESRF (European Synchrotron Radiation Facility). We observed an increase in the spatial coherence of the condensate when the temporal coherence is enhanced and we investigated several mechanisms of interactions between two charge density waves.
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Submitted on : Tuesday, January 20, 2004 - 2:34:27 PM
Last modification on : Friday, December 18, 2020 - 1:34:04 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:12:52 PM

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  • HAL Id : tel-00004231, version 1

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Anthony Ayari. Etude des propriétés mésoscopiques dans les systèmes quasi-unidimensionnels à onde de densité de charge. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2002. Français. ⟨tel-00004231⟩

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