Measurements have been made of the phase velocity and the attenuation of helicon waves propagated parallel to the axis of a long cylinder of indium metal at 4.2 °K. A constant magnetic field was applied parallel to the axis of the cylinder. Both the axisymmetric ( m = 0) and dipole ( m = ±1) modes were studied. The experimental results are compared with the predictions of theory for two different assumptions concerning the boundary conditions. It is shown that the theoretical predictions which include non-zero vacuum fields give the best agreement with the experiment. The Hall coefficient derived from these measurements is consistent with that calculated on the assumption of one hole per atom within the experimental error (similar 1.5%).
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Harding et al. (1965) studied this question.
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