Geometry of Slow Structural Fluctuations in a Supercooled Binary Alloy

被引：108

作者：

Pedersen, Ulf R. ^{[1
,2
]}

Schroder, Thomas B. ^{[1
]}

Dyre, Jeppe C. ^{[1
]}

Harrowell, Peter ^{[3
]}

机构：

[1] Roskilde Univ Ctr, Dept Sci, IMFUFA, DNRF Ctr Glass & Time, DK-4000 Roskilde, Denmark

[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[3] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 10期

基金：

新加坡国家研究基金会; 澳大利亚研究理事会;

关键词：

MOLECULAR-DYNAMICS; ENERGY; MODEL; GLASS; LIQUIDS;

D O I：

10.1103/PhysRevLett.104.105701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The liquid structure of a glass-forming binary alloy is studied using molecular dynamics simulations. The analysis employs the geometrical approach of Frank and Kasper to establish that the supercooled liquid contains extended clusters characterized by the same short range order as the crystal. The steep increase in the heat capacity on cooling is directly coupled to the growing fluctuations of the Frank-Kasper clusters. The relaxation of particles in the clusters dominates the slow tail of the self-intermediate scattering function.

引用

页数：4