Study of the audio-frequency magnetic field penetration in cadmium using the radio-frequency size effect

Abstract

In radio-frequency size effect (RFSE) measurements the Gantmakher resonance signals are not in phase with the modulation magnetic field when the latter is screened by the induced audio-frequency currents. The dependence of this phase lag on modulation frequency (1-1000 Hz) has been studied as a function of temperature (1.4 to 4.2K) and orientation in cadmium. This gives relaxation times associated with the first two modes of the induced electric field which exhibit similar anisotropy as found in bulk resistivity and RFSE measurements at low temperatures. The mode-mode, off-diagonal relaxation times are found experimentally to be non-negligible, contrary to previous numerical calculations of Brandli and Cotti (1965, 1969).