Screening and conductance relaxations in insulating granular aluminium thin films

Julien Delahaye (1) , Thierry Grenet (1)

1 NEEL - MagSup - Magnétisme et Supraconductivité

We have recently found in insulating granular Al thin film a new experimental feature, namely the existence of a conductance relaxation that is not sensitive to gate voltage changes. This conductance relaxation is related to the existence of a metallic-like screening in the film and can be used to estimate its characteristic length scale. In the present paper, we give some experimental details on how this feature was measured and present our first results on the screening length temperature dependence.

Mots clés: disordered insulators; electron glass; electrical field effect

Domaines: Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn]

Julien Delahaye, Thierry Grenet. Screening and conductance relaxations in insulating granular aluminium thin films. Journal of Physics: Conference Series, 2012, 376, pp.012008. ⟨10.1088/1742-6596/376/1/012008⟩. ⟨hal-00711209⟩