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Etude des ondes de densité de charge par diffraction cohérente des rayons X

Abstract : Charge Density Wave (CDW) compounds have been extensively studied during the 80s for their remarkable transport properties. Yet, there are still many unanswered questions. The use of new experimental techniques can address some of these issues.After presenting the basic principles of Coherent X-ray diffraction (CXRD), we show, using as an example the study of dislocation loops in silicon, how this experimental technique allows probing phase faults present in crystals.We continue with studies on CDW in the canonical compounds NbSe3 and K0.3MoO3. We study with DCRX the influence of defects in the sliding of a CDW in the compound NbSe3.Finally we present experiments on coexistence between CDW and spin density wave in Chromium and the coexistence of CDW and superconductivity in the compound NbSe2. These preliminary experiments suggest that superconductivity increases the coherence of CDW and that the spin-flip transition, present in Chromium, has effects on CDW.
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Edouard Pinsolle. Etude des ondes de densité de charge par diffraction cohérente des rayons X. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2012. Français. ⟨NNT : 2012PA112283⟩. ⟨tel-00789152⟩

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