| 摘 要： | The infrared divergence response theory is applied toreorientational relaxation process of magnetic clusters in cluster spinglass(CoF_2)_(0.5)(BaF_2)_/(0.2)(NaPO_3)_(0.3)to study the behaviour of low temper-ature ultrasonic absorption in this system.Our calculation results showedthat the reorientational relaxation process makes the main contributions tothe magnetic part of the ultrasonic absorption for T<4.0K;as forT>4.0K,the contributions of the internal process inside the clustersmust be considered.
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