Abstract

Spin splitting factors γ of electrons are determined from the measuremtents of quantum oscillations of velocity of sound. It is found that, near tire binary and the trigonal axes where electrons have heavy cyclotron masses, experimental γ deviates systematically from the theoretical γ predicted from the SBR-Baraff model. A new model to account for this discrepancy is proposed. It is based on the stronger effects of the remote bands to the conduction band energy than those considered by Baraff.

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