Frequency dependence of impedance oscillations in tungsten plates in a magnetic field perpendicular to the surface

The dependence of the amplitude of size effects in the impedance of tungsten plates placed in a magnetic field oriented perpendicular to the surface on the frequency of the external wave in the range 3 MHz–900 Hz for symmetrical and antisymmetrical methods of excitation is studied experimentally. A substantial lowering of the frequency of the external wave enabled the observation of a continuous transition in the experiment from radio-frequency size effects to the quasistationary Sondheimer effect. Theoretical analysis of the ratio of the amplitudes of size effects in the impedance together with the experimental results enabled an accurate physical interpretation of the observed oscillations and determination of the region of magnetic fields in which the observed impedance oscillations at radio frequencies can be uniquely identified as Sondheimer oscillations.

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