SPIN-SPIN INTERACTIONS IN BIXGD1-XVO4 COMPOUNDS - AN EPR STUDY

Changes in magnetic interactions in the BixGd1-xVO4 compounds (0 less than or equal to x less than or equal to 0.64) were measured using EPR as a function of x. For 0 < x < 0.1 and 0.55 < x < 0.64 dipolar inter actions predominate, while for 0.1 < x < 0.55 dipolar and exchange int eractions are in competition. The relative predominance of each type o f interaction is related to the results of diffuse reflectance and Ram an diffusion spectroscopies. Linewidth changes as a function of x are also discussed.