The shape of the i=2 minimum of the ac longitudinal resistance R/sub x/ of a quantum Hall device has been obtained at different frequencies from 160 Hz to 16 kHz. The frequency dependence of the resistance and the virtual reactance, measured at the i=2 and i=4 plateau centers with different circuit conditions, have been analyzed. The measurements have been performed with a new system, which includes dedicated electronic units to maintain close to zero the voltage at the current measurement terminal of the device and the current at the voltage terminals. Within the validity of the equivalent circuit adopted to represent the quantum Hall device and the measuring system, R/sub x/ was found to follow an increasing function of frequency, in agreement with previous investigations.
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Cabiati et al. (1999) studied this question.
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