Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin  

作　　者：刘慧美 陆成亮 王克锋 刘俊明 王清 董闯 

机构地区：[1]Laboratory of Solid State Microstructures,Nanjing University [2]International Centre for Materials Physics,Chinese Academy of Sciences [3]State Key Laboratory of Materials Modification,Dalian University of Technology

出　　处：《Chinese Physics B》2010年第1期441-445,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. 50601013, 10674061 and 50832002);the National Basic Research Program of China (Grant No. 2006CB921802)

摘　　要：The low temperature specific heat of Sm-AI-Co ternary metallic glasses is investigated and a clear anomaly associated with the Boson peak is identified. While this anomaly depends slightly on the chemical composition, it has no dependence on external magnetic field. To figure out the mechanism of the Boson peak, we interpret the data within various model frameworks. Unlike earlier work, our study shows that this Boson peak is mainly ascribed to an additional T2 term of the specific heat, which may originate from the quasi-two-dimensional and short-range ordered structure units possibly existing in the metallic glasses.The low temperature specific heat of Sm-AI-Co ternary metallic glasses is investigated and a clear anomaly associated with the Boson peak is identified. While this anomaly depends slightly on the chemical composition, it has no dependence on external magnetic field. To figure out the mechanism of the Boson peak, we interpret the data within various model frameworks. Unlike earlier work, our study shows that this Boson peak is mainly ascribed to an additional T2 term of the specific heat, which may originate from the quasi-two-dimensional and short-range ordered structure units possibly existing in the metallic glasses.

关 键 词：metallic glasses Boson peak specific heat 

分 类 号：TG139.8[一般工业技术—材料科学与工程]