Abstract
Alfven-wave propagation in single-crystal graphite has been studied at 4.2 K with wavelengths of 392.5, 433 and 512.5 mu m in magnetic fields up to 8.5 T applied along the c axis in the Faraday geometry. The mass density function obtained from the magnetic field dependence of interference maxima is in excellent agreement with the predicted value from the parameters of graphite. The amplitude of the propagating wave is larger with the circular polarisation of the infrared set to sense holes than it is to sense electrons and the amplitude is reduced when the hole Landau levels coincide with the Fermi surface. The propagating wave has a higher amplitude for the hole polarisation at a given magnetic field because the holes have a smaller mass than the electronics but the dispersion of the propagating wave is given by the linear wave approximation for Alfven waves.
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