We have measured the complex magnetoconductance of disordered mesoscopic Ag rings at frequencies from 250 Hz to 1.2 GHz. Conductance oscillations with flux period h/e are observed over the entire frequency range. No suppression of the h/e amplitude is seen up to our highest measurement frequency, even though it is several times the inverse sample transit time τL^-1. An h/e-periodic imaginary part of the conductance is observed at frequencies {ω}{}τL^-1. The results suggest that the h/e oscillation would only be suppressed if {ω} were greater than both τL^-1 and the thermal frequency kT/{}.
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Pieper et al. (1994) studied this question.
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