Interaction between Magnetic Ions in an Insulator —Case of Degenerate Orbitals—. II

Abstract

Explicit expressions for the effective interaction Hamiltonian in the case of degenerate orbitals and the spin dependent transition moment for two exciton excitation which had not been derived in the previous paper (J. Phys. Soc. Japan 45 (1978) 1559) are given. The formalism can easily be extended to include the effect of the spin-orbit interaction in the effective Hamiltonian.