A Study of Spin-Phonon Interactions by Spin-Lattice Relaxation Processes
When a particular transition in a paramagnetic impurity has been saturated, the return to thermal equilibrium with the lattice does not necessarily follow a simple exponential. Even when it does the relaxation time τ1 so defined cannot usually be predicted by theory, one problem being to take adequate account of the lattice dynamics. The situation is often even more complicated when the ground state of the monitored ion is not a simple doublet and when other impurities are present in the sample. The return to thermal equilibrium is then seriously affected by cross relaxation both within the monitored spin system and also to other fast relaxing ions. In such a situation it is not easy to relate the τ1 measured experimentally to particular spin-lattice transition probabilities.
KeywordsAnisotropy Helium Ruby
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