Abstract
Spin-lattice relaxation times of Co 2+ spins in yttrium aluminum garnet (YAG) are investigated below 100 K. Co 2+ impurities in YAG have the octahedral, tetrahedral and interstitial sites and these spins have considerably different local crystalline electric field symmetries and intensities. The observed relaxation times well reflect the local fields and it is found that the octahedral and interstitial spins show the Orbach relaxation process with the energy gap Δ / k of 280 K and 95 K, respectively, while the tetrahedral spin shows simple direct- and Raman-processes.
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