SPIN-SPIN INTERACTIONS OF CE3+ IONS IN THE ELPASOLITE CRYSTAL CS2NAINCL6

The EPR method is used to study at T=4.2 K crystals of Cs2NaInCl6:Ce3 (1 mol %) at which have elpasolite structure. A solitary cubic Ce3+ c enter and three types of Ce3+-Ce3+ pairs were observed, for which the spin-spin interaction parameters D and E were determined. It is establ ished that deformation of the local structure results in a shift {Delt a g} of the pair relative to the g-factor of the solitary center. Mode ls of the solitary center and the three types of Ce3+-Ce3+ pairs are d iscussed, as well as the nature of the spin-spin interactions in the p airs. The non-dipole nature of the interactions is established. Possib le chains for the creation of an indirect exchange between the Ce3+ io ns are considered. (C) 1997 American Institute of Physics.