Manifestation of ageing in the low temperature conductance of disordered insulatorsReport as inadecuate




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1 MagSup - Magnétisme et Supraconductivité NEEL - Institut Néel

Abstract : We are interested in the out of equilibrium phenomena observed in the electrical conductance of disordered insulators at low temperature, which may be signatures of the electron coulomb glass state. The present work is devoted to the occurrence of ageing, a benchmark phenomenon for the glassy state. It is the fact that the dynamical properties of a glass depend on its age, i.e. on the time elapsed since it was quench-cooled. We first critically analyse previous studies on disordered insulators and question their interpretation in terms of ageing. We then present new measurements on insulating granular aluminium thin films which demonstrate that the dynamics is indeed age dependent. We also show that the results of different relaxation protocols are related by a superposition principle. The implications of our findings for the mechanism of the conductance slow relaxations are then discussed.

Keywords : Disordered solids Time-dependent properties relaxation Electronic transport in mesoscopic systems Coulomb blockade single electron tunnelling





Author: Thierry Grenet - Julien Delahaye -

Source: https://hal.archives-ouvertes.fr/



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