Abstract
We report on the observation of zero-bias anomalies and above-the-gap structure in the current - voltage characteristics of Au - - Pb tunnel junctions. The above-gap modulations appear at energies that scale with the superconductor gap. Following thermal anneals these energies shift randomly in the range 4 - 20 mV. The conductance changes associated with these anomalies also vary in a non-systematic way and are typically of the order of .
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