We have measured the complex magnetoconductivity of disordered quasi-one-dimensional Ag wires at 1 GHz and at 200 Hz. Because 1 GHz is of the same order as the dephasing rate, we have been able to observe the frequency dependence of weak localization. Both the real and imaginary parts of the conductivity at 1 GHz are in good agreement with theory. The data yield an accurate value for the electron diffusion constant, which is not well determined by dc measurements, and support the theory of weak localization at finite frequency, due originally to Gor'kov, Larkin, and Khmel'nitskii.
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Pieper et al. (1992) studied this question.
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