Abstract
Zeeman optical absorption spectra of Er:GdAlO3 have allowed a determination of the principal values of the Er3+-Gd3+ exchange interaction for the ground state and the lowest components of 4S3/2 and 4F9/2 states of Er3+. Using these interaction data, the highly nonlinear behaviour of the low field Zeeman spectra (H<40 kG) can be explained satisfactorily for the highest energy lines, which can be assigned unambiguously. Qualitative evidence for canting of Gd3+ moments which are NN to Er3+ ions is discussed, and a study of the angular dependence of the spin flop field provides evidence that the Gd3+ moments flop into the bc rather than the ab plane.
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