Abstract
We have measured the complex magnetoconductance of disordered mesoscopic Ag rings at frequencies from 250 Hz to 1.2 GHz. The data show conductance oscillations of flux period h/ e which persist to our highest measurement frequency with nearly constant average amplitude. From physical considerations and from a naive extension of dc transport theory, an exponential decay of the oscillations is expected at these frequencies. Our results are in conflict with this expectation.
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