ENDOR measurements of spin transfer in (VF6)4-

Abstract

EPR and ENDOR measurements have been made to investigate the covalent spin transfer for substitutional V²⁺ in KMgF₃. The hyperfine parameters for the F^- ligands are A=-20.99+or-0.02 MHz and B=-5.70+or-0.04 MHz. Hence, the unpaired spin densities in fluorine 2p_pi , 2p_sigma and 2s orbits which arise from covalent transfer to, and overlap with, the V²⁺3d and 4s orbits are estimated to be f_pi =(2.6+or-0.3)%, f'_sigma =-(0.3+or-0.2)% and f'_s=-(0.1+or-0.01) respectively. The covalency model used in interpreting the hyperfine parameters leads to a g factor consistent with the experimental value of 1.972.