• 28 July 2000
Abstract
We report resistance relaxation and fluctuations in the normal state of quench-condensed granular Al films with sheet resistance near 10 k-Ohm/sq. Below 300 mK, resistance is strongly hysteretic and displays ultraslow, non-exponential relaxation as temperature is varied. Further lowering the temperature, resistance fluctuations with drastically increased size and decreased characteristic frequency are observed. We argue that the resistance fluctuations suggest for the first time a correlated hopping of many electrons between the low energy states of the electron glass at low temperatures.