含红外发散的集团自旋玻璃体系的超声吸收

Ultrasonic absorption with infrared divergence in cluster spin glass

本文将红外发散响应理论应用到集团自旋玻璃体系中磁集团取向变化弛豫过程,研究自旋玻璃体系(COF_7)_(0.5)(BaF_2)_(0.2)(NaPO_3)_(0.3)的低温超声吸收特性。结果表明T<4.0K时,超声吸收的磁贡献部分主要来自于磁集团的集体转向弛豫过程;T>4.0K时,超声吸收的磁贡献部分是集团集体转向过程和集团内部贡献的迭加。

The infrared divergence response theory is applied to reorientational relaxa tion process of magnetic cluster in cluster spin glass (CoF2)0.5(BaF2)0.2(NaPO3)0.3 to study the behaviour of low temperature ultrasonic absorption in this system. Our calculation showed that the reorientational process makes the main contribution to the magnetic part of the ultrasonic absorption for T<4.0K; as for T>4.0K, the intraprocess of the cluster can not be neglected.