NUMERICAL-STUDIES OF MAGNETIZATION RELAXATION OF S-TYPE IONS WITH SPIN 5 2 IN CUBIC-CRYSTALS/

The numerical solutions of rate equations for S-type ions with spin qu antum number 5/2 (e.g. Mn2+ centers in zinc blende crystals) are used for the description of magnetization relaxation. Two types of relaxati on mechanisms are taken into account, namely modulation of the crystal field and/or magnetic interaction by lattice vibrations. The first on e allows transitions with DELTAS(z) = +/-1, +/-2, and the second one o nly those with DELTAS(Z) = +/-1. In both cases the magnetization relax es exponentially over many orders of magnitude, in some cases showing two characteristic time constants. At higher magnetic fields these con stants are related to transition probabilities by a simple formula.