@article{9a0a5be9e4a040fa8ea5679866c6f574,
title = "Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses",
abstract = "In glassy materials, the Johari-Goldstein secondary (β) relaxation is crucial to many properties as it is directly related to local atomic motions. However, a long-standing puzzle remains elusive: why some glasses exhibit β relaxations as pronounced peaks while others present as unobvious excess wings? Using microsecond atomistic simulation of two model metallic glasses (MGs), we demonstrate that such a difference is associated with the number of string-like collective atomic jumps. Relative to that of excess wings, we find that MGs having pronounced β relaxations contain larger numbers of such jumps. Structurally, they are promoted by the higher tendency of cage-breaking events of their neighbors. Our results provide atomistic insights for different signatures of the β relaxation that could be helpful for understanding the low-temperature dynamics and properties of MGs.",
author = "Yu, {Hai Bin} and Yang, {Meng Hao} and Yang Sun and Feng Zhang and Liu, {Jian Bo} and Wang, {C. Z.} and Ho, {K. M.} and Ranko Richert and Konrad Samwer",
note = "Funding Information: The computational work was carried out at the TianHe-1(A) of the National Supercomputer Center in Tianjin, China and the TianHe-2 of the National Supercomputer Center in Guangzhou, China and the Gesellschaft fur wissenschaftliche Datenverarbeitung, G{\"o}ttingen (GWDG), Germany. H.-B.Y. acknowledges support from the National Science Foundation of China (NSFC 51601064) and the National Thousand Young Talents Program of China. K.S. acknowledges support from the German Science Foundation within the FOR 1394, P1. Work conducted at Ames Laboratory was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Science and Engineering Division, under Contract No. DE-AC02-07CH11358, including a grant of computer time at the National Energy Research Supercomputing Center (NERSC) in Berkeley, CA. Publisher Copyright: Copyright {\textcopyright} 2018 American Chemical Society.",
year = "2018",
month = oct,
day = "4",
doi = "10.1021/acs.jpclett.8b02629",
language = "English (US)",
volume = "9",
pages = "5877--5883",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "19",
}