EPR Studies of Gd³⁺, Dy³⁺, and Ce³⁺ in some Van Vleck Paramagnets

Abstract

EPR of Gd³⁺ in the Van Vleck paramagnets, PrPb₃ and TmCd have been investigated. The temperature-dependent linewidths have been found to be in agreement with the prediction of Moriya and Obata. In a complementary study, non-S-State Dy³⁺ in TmP, TmAs, PrP, PrAs, PrSb, PrBi and PrS, and Ce³⁺ in TmS, TmAs, PrS and PrP have been examined. For all these cases, (S-state as well as the non-S-state magnetic ions), the temperature variation of the g-shifts follows the susceptibilities of the hosts. The exchange coupling constants between the impurity ions and the host magnetic ions have been obtained.