Abstract
Magnetophonon resistance oscillations have been observed in n-PbS at 77K. These oscillations arise from scattering of electrons by longitudinal optical phonons between Landau levels when the optical phonon energy h(cross) omega LO becomes a multiple of the cyclotron energy h(cross) omega c. After corrections for the phase shift arising from the variation in amplitude of the resonance peaks and for the polaron effect, the cyclotron mass is found to be mc*=0.083 m0.
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