Abstract
Mössbauer relaxation measurements have been made on 170Yb3+ in DyAlO3, TbAlO3 and HoAlO3. In DyAlO3 and TbAlO3 between 30 K and TN and in HoAlO3 between 30 and 10K conventional temperature inde pendent spin-spin driven relaxation is observed. In HoAlO3 below 10K, the relaxation rate is tempe rature dependent. This behaviour is interpreted in terms of coupling between Yb3+ and the collective excitations of the two singlet level ground states of the Ho3+ ions.
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