Conductance fluctuations in thin silver films

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Abstract
We have studied the behavior of thin Ag films at low temperatures. For samples with lengths and widths each approximately 1 μm, we have observed fluctuations of the conductance at temperatures below about 0.3 K. These fluctuations are observed in measurements of the conductance, G, as a function of time, and of magnetic field. The time-dependent fluctuations appear to be due to the motion of individual scattering centers, while the field-dependent fluctuations are similar to the aperiodic variations of G seen previously in other systems. The magntiudes of the time- and field-dependent fluctuations are approximately the same, and are in very reasonable agreement with the theory of universal-conductance fluctuations.