Abstract
A review is given on the effects of the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction between localized spins in various dimensionality systems of doped diluted magnetic semiconductors (DMS). Since this interaction is long-range, its influence on the temperature and magnetic field dependencies of magnetization and spin splitting of the bands is evaluated in the mean-field approximation, but by taking into considerations disorder-modified carrier–carrier interactions. The results show that the hole densities, which can presently be achieved, are sufficiently high to drive a paramagnetic–ferromagnetic phase transition in bulk and modulation-doped structures of II–VI DMS. Our recent photoluminescence studies on MBE-grown samples, containing a single, modulation-doped, 8 nm quantum well of Cd 1− x Mn x Te/Cd 1− y− z Mg y Zn z Te:N are discussed. These studies reveal the presence of a ferromagnetic transition induced by the two-dimensional hole gas. The transition occurs between 1.8 and 2.5 K, depending on the Mn concentration x, in agreement with the theoretical model.
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