A spherical model of the bound magnetic polaron in wide-gap semimagnetic semiconductors is described. The analysis includes effects due to the saturation of the spin-correlation function between the carrier and the magnetic ions. Magnetic fluctuations enter in a natural way: The assumption that the magnetic entropy follows the classical Gaussian form is not used.

• Received 20 December 1984

DOI:https://doi.org/10.1103/PhysRevB.31.6579