MAGNETOPHONON RESONANCE IN P-CDSB

The magnetophonon resonance in p-CdSb single crystals [p similar to(2. 5-10.0) X 10(15) cm(-3)] was investigated. Magnetophonon oscillations were observed in the transverse magnetoresistance and in the Hall effe ct with different orientations of the magnetic field H with respect to the axes of the crystal (a, b, c) in fields H < 370 kOe at temperatur es 55-125 K. It was established that for the orientations H parallel t o a and H parallel to c the current carriers interact effectively with two longitudinal optical phonon modes and for orientations H parallel to b with three longitudinal optical phonon modes. Comparison of the phonon frequencies determined from the magnetotransport data and from infrared reflection spectra revealed modes which interact effectively with charge carriers. The appearance of magnetophonon oscillations of the Hall voltage is explained by the failure to satisfy absolutely the strong magnetic field condition. (C) 1996 American Institute of Physi cs.