DETERMINATION OF EXCITON ZEEMAN SPLITTINGS IN CD1-XMNXTE FROM FARADAY-ROTATION MEASUREMENTS

Reflectivity and Faraday rotation measurements were carried out on Cd1 -xMnxTe bulk crystals in the complete zinc-blende range of composition 0 < x less than or equal to 0.71. From a comparison of the results of these two experiments for samples with z less than or equal to 0.3, w e demonstrate that the Faraday angle Theta, measured in limited spectr al range, is proportional to the energy splitting of exciton states De lta E, measured at the same temperature (2 K) and magnetic field B (up to 5 T). The determined proportionality constant was used to calculat e Delta E values also for x > 0.3. This allowed us to find an empirica l description of Delta E values for the whole range of compositions as a function of B and x.