Theory of anisotropic diamagnetism, local moment magnetization and carrierspin-polarization in Pb1-xEuxTe

We present theoretical analyses of anisotropic lattice diamagnetism, magnet ization due to magnetic ions and carrier spin-polarization in the diluted m agnetic semiconductor, Pb1-xEuxTe. The lattice diamagnetism results from or bital susceptibility due to inter band effects and spin-orbit contributions . The spin-orbit contribution is found to be dominant. However, both the co ntributions show pronounced anisotropy. With increase in x, the diamagnetis m decreases. We consider contributions from randomly distributed isolated m agnetic ions and clusters of pairs and triads for the local moment magnetiz ation. The isolated magnetic-ion contribution is the dominant one. We calcu late the magnetization for two typical magnetic ion concentrations: x = 0.0 3 and x = 0.06, Temperature dependence of the magnetization is also conside red. Apart from lattice and localized magnetic ions, the carrier contributi on to the spin-density is also calculated for a carrier density of p = 10(1 8) cm(-3). The relative spin-density of carriers increases with increase in the magnetic field strength and magnetic ion concentration. The agreement with experiment where available is reasonably good.