Abstract
A new theoretical model of spin-lattice relaxation for magnetic "ion pairs" has been developed in which both the "spin-phonon" and "spin-spin" interactions are jointly effective in producing a net relaxation transition. The Raman-type indirect two-phonon relaxation rate for non-Kramers as well as Kramers ion pairs shows ${T}^{7}$ dependence at low temperatures and ${T}^{3}$ dependence at high temperatures. The ${T}^{3}$ dependence is entirely a new result. The ${T}^{7}$ dependence for Kramers pairs is also a new result as it is not possible in the usual Van Vleck mechanism. Even the ${T}^{7}$ dependence for non-Kramers ion pairs is different from a similar standard result for unpaired ions. It appears that the electronic spin relaxation behavior of ion pairs may be quite different from that of unpaired ions.
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