Ageing in granular aluminium insulating thin films

Abstract

We present a new set of electrical field effect measurements on granular aluminium insulating thin films. We have explored how the conductance relaxations induced by gate voltage changes depend on the age of the system, namely the time elapsed since its quench at low temperature. A clear age dependence of the relaxations is seen, qualitatively similar to ageing effects seen in other well studied glassy systems such as spin glasses or polymers. We explain how our results differ from the previous ones obtained with different protocols in indium oxide and granular aluminium thin films. Our experimental findings bring new information on the dynamics of the system and put new constraints on the theoretical models that may explain slow conductance relaxations in disordered insulators.

4 pages, 13th Transport in interacting disordered systems (TIDS13) conference, 31.08.2009 - 05.09.2009, Rackeve, Hungary

References in corpus (6)

• The glass transition and the Coulomb gap in electron glasses
• Stress-aging in the electron-glass
• A mean-field model for the electron glass dynamics
• History-dependent relaxation and the energy scale of correlation in the Electron-Glass
• Density of States and Critical Behavior of the Coulomb Glass
• Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium