The magnetoresistance of three samples of high purity n-type insb(n d -n a varying from 5*10 13 to 5*10 14 cm -3 ) is studied at lattice temperatures of 11 and 20 k with electric field strengths sufficient (>100 mv cm -1 ) to heat the electron distribution appreciably above the temperature of the lattice and at magnetic field strengths such that the effect of landau quantization is apparent. Two distinct types of magnetophonon extrema are observed, each having a different dependence on electric field and temperature. The first consists of a series of minima which are only observed when the electron temperature is in excess of about 20 k and which arises from the emission of long wavelength longitudinal optical (lo) phonons.
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Stradling et al. (1970) studied this question.
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