Abstract
Electron paramagnetic resonance spectra of Yb3+ ions in theoptically bistable compound Yb:CsCdBr3 are presented. Thefeatures observed are assigned to the symmetrically coupled paircomplexes of the type Yb3+-VCd-Yb3+ (VCd being a cadmium vacancy) whose axis is parallel to thecrystallographic c-axis. There are no asymmetric pairs of the typeYb3+-Yb3+-VCd. It is shown that simulation ofthe spectra is possible only if an exchange interaction is takeninto account in the spin Hamiltonian. The value of J = -0.0016 cm-1 shows that the exchange interaction isantiferromagnetic but extremely weak. It is also found that thereis a significant relaxation (about 12%) of Yb3+ ions towardthe Cd vacancy. From the experimental g-tensor values, it isestablished that the lower ground state of Yb3+ ions inCsCdBr3 is mainly composed of 4fϕ (63%) and4fδ (32%) ytterbium orbitals. It has been previouslyproposed that optical bistability is due to asymmetric pairs of thetype Yb3+-Yb3+-VCd. On the basis of thepresent work, this now appears unlikely.
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