MAGNETOREFLECTANCE AND MAGNETIZATION OF THE SEMIMAGNETIC SEMICONDUCTOR CD1-XFEXSE

Magnetoreflectance measurements of excitonic interband transitions are used to study exchange interaction between band electrons and localized Fe d electrons in hexagonal Cd1-xFexSe (x0.13) at T=1.9 K and B5 T. Combining exciton splitting with the magnetization of the same samples, we determined the difference between conduction- and valence-band exchange constants N0±-N02=1.85 eV. Given from previous work N0±=0.25 eV, the value N02=-1.6 eV is obtained. We also demonstrate that the band splittings are parametrized by macroscopic magnetization for the magnetic field oriented parallel as well as perpendicular to the crystal hexagonal axis. Additionally, we present a theoretical model for magnetization, x<0.05. © 1990 The American Physical Society.