Spin-lattice coupling coefficients of Mn2+ ions in stacking faults of ZnS

The spin-lattice coupling coefficients (SLCC) of Mn²⁺ ions in axial sites PN of cubic ZnS crystals containing stacking faults have been measured by an uniaxial stress method. These coefficients were correctly interpreted in an ionic model by taking into account the Blume-Orbach mechanism adapted to a C_3v symmetry and a relativistic mechanism whose importance has been previously demonstrated. Finally, a comparison between the experimental SLCC's for Mn₂₊ in the cubic sites and two axial sites PN and AS due to stacking faults shows that they are roughly identical as predicted theoretically.