title: Effects of atomic interaction stiffness on low-temperature relaxation of amorphous solids.
abstract: While low-temperature relaxations show significant differences among metallic glasses with different compositions, the underlying mechanism remains mysterious. Using molecular dynamics simulation, low-temperature relaxation of amorphous solids is investigated in model systems with different atomic interaction stiffness. It was found that as the interaction stiffness increases, the low-temperature relaxation is enhanced. The fraction of mobile atoms increases with increasing interaction stiffness, while the length scale of dynamical heterogeneity does not change. The enhanced relaxation may be due to increased dynamical heterogeneity. These findings provide a physical picture for better understanding the origin of low-temperature relaxation dynamics in amorphous solids, and the experimentally observed different β-relaxation behaviors in various metallic glasses.
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. whw@iphy.ac.cn.
authors.forename: Y T
authors.initials: YT
authors.lastname: Sun
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. whw@iphy.ac.cn and Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Zhejiang 315201, P. R. China.
authors.forename: J Q
authors.initials: JQ
authors.lastname: Wang
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. whw@iphy.ac.cn.
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Li
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. whw@iphy.ac.cn.
authors.forename: H Y
authors.initials: HY
authors.lastname: Bai
authors.affiliation: Department of Physics, Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, P. R. China. maozhili@ruc.edu.cn.
authors.forename: M Z
authors.initials: MZ
authors.lastname: Li
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. whw@iphy.ac.cn.
authors.forename: W H
authors.initials: WH
authors.lastname: Wang