High-magnetic-field EPR inCd1−xMnxTe

Magnetic resonances have been studied in ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Te for 0.002≤x≤0.1 by means of far-infrared magnetotransmission at fields up to B=22 T. EPR of the ${\mathrm{Mn}}^{2+}$ ions is observed, accompanied by many orientation-dependent satellite resonances. These satellites are explained in terms of excitations of exchange-coupled ${\mathrm{Mn}}^{2+}$ pairs, and the presence of anisotropic exchange is strongly suggested. At x≥0.02 a very strong magnetic-field-induced line broadening is observed for B>10 T. This broadening is explained in terms of a cross-correlation mechanism using exchange-coupled clusters as fast-relaxation centers.