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The optical and transport properties of semimagnetic semiconductor Hg,,,Mn,.,,Se in t h e temperature range 10-300 K have been studied. T h e farinfrared reflectivity spectra of this alloy were analysed using a numerical fitting procedure, based on the model of plasmon-phonon interaction. The characteristic frequencies of the phonons and plasmons and their temperature dependences were determined. The electron concentration. as defined by the Hall and Shubnikov-de Haas effect, practically does not depend on the temperature or on the applied magnetic field. By combining the results of the optical and transport measurements, t h e temperature dependences of effective mass and carrier mobility were determined

Free CarrierScattering in Hg0,77Mn0,23Se at Low Temperatures 0. iIe1d ( a ) , Z.V. POPOVId ( b ) , A. MILUTINOVId ( b ) , and V.A. KULBACHINSKII ( c ) BY