# Importance des fluctuations spatio-temporelles et des non linéarités pour le transport dans les verres isolants

Abstract : This work deals with transport in insulating glasses. In such solids, the discrete translational symmetry is lost, which means that the plane wave analysis is not a priori the right starting point''. As a result, the transport is more difficult to handle, and a huge amount of works have been devoted to many aspects of transport in disordered systems, especially since the seventies. Here we focus on three specific questions: (i) the heat transport in glasses submitted to micro-beams and the associated irreversible vaporisation; (ii) the electronic d.c. transport, below 1 Kelvin, in Mott-Anderson insulators, i.e. in electron glasses'' where both disorder and electron-electron interactions are relevant; (iii) the low frequency dielectric constant in structural glasses'' (i.e. ordinary glasses'') which, below 1 Kelvin, is both universal (i.e. independent on the chemical composition) and very different of that of crystals. For each topic, we present both original experiments and the new theoretical concepts that we have elaborated so as to understand the main experimental features. Eventually, it appears that, in any case, transport in insulating glasses is strongly dominated by quite a small part of the glass-applied field'' ensemble and that the nonlinear response is a relevant tool to get informations on this sub-part'' which dominates the transport in the whole system.
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Contributor : Marc Gingold <>
Submitted on : Friday, September 26, 2003 - 8:38:39 AM
Last modification on : Monday, February 10, 2020 - 6:12:21 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:31:43 PM

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• HAL Id : tel-00003424, version 1

### Citation

François Ladieu. Importance des fluctuations spatio-temporelles et des non linéarités pour le transport dans les verres isolants. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 2003. ⟨tel-00003424⟩

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