Interaction Effects in Potassium Ferricyanide

Abstract

The character and magnitude of the exchange interaction between the ferric ions in K₃Fe(CN)₆ have been investigated by, (1) observation of the paramagnetic resonance spectrum of coupled Fe-Fe pairs in semi-dilute crystals and, (2) adiabatic demagnetization of concentrated crystals. The results show that the exchange between magnetically similar ions contains an appreciable anisotropic part of the order of 0.07 cm⁻¹. No lines corresponding to dissimilar ion pairs were found. From the two types of experiments, it is concluded that the isotropic part of exchange between similar ions, J_s, is about 0.25 cm⁻¹ and that the exchange between dissimilar ions is very small.