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Dynamique et structure d'une onde de densite de charge

Abstract : This study belongs to a thematic common to many physical systems: an elastic system in interaction with disorder. We have studied the dynamic of a charge density wave (CDW) system by means of transport and X-ray diffraction measurements in a quasi-onedimensional material, NbSe3. The aim of these experiments is to study the CDW deformations when the CDW is moved by an external field force, here the electrical field. We have developed a new sample fabrication process using the micro-nano-electronic technique. The monocrystal is placed and glued onto a silicon membrane equipped with gold contacts buried into a silica layer. At T = 100 K, when the CDW is set in motion, we have observed that the system is more ordered along the crystal chains and less ordered transversally to the chains. This result confirms a number of theories which predict a dynamical ordering of the elastic systems. In a second time, we have shown that there exists an interaction between the two CDWs present in NbSe3 at low temperature (T < 59 K). We have observed antagonistic variations of the two CDW periodicities above a certain electrical field value. We interpret this charge transfer as a dynamical decoupling between the two CDWs. We present a preliminary phenomenological model which explains the observed dynamical behavior.
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https://tel.archives-ouvertes.fr/tel-00004162
Contributor : Romain Danneau <>
Submitted on : Wednesday, January 14, 2004 - 1:59:08 AM
Last modification on : Friday, December 18, 2020 - 1:34:04 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:15:27 PM

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  • HAL Id : tel-00004162, version 1

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Romain Danneau. Dynamique et structure d'une onde de densite de charge. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00004162⟩

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