Light-induced giant softening of network glasses observed near the mean-field rigidity transition

被引：59

作者：

Gump, J

Finkler, I

Xia, H

Sooryakumar, R

Bresser, WJ

Boolchand, P

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Univ Cincinnati, Dept Elect Comp Engn & Comp Sci, Cincinnati, OH 45221 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 24期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.92.245501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The longitudinal acoustic (LA) mode of bulk GexSe1-x glasses is examined in Brillouin scattering (BS) over the 0.15<x<1/3 range using near band-gap radiation (lambda=647.1 nm). The LA-mode frequency (nu(LA)) softens with increasing laser power in an athermal and reversible manner by nearly 30% (=Deltanu(LA)/nu(LA)) near x=x(c)=0.19(1) or mean coordination number, r(c)=2+2x(c)=2.38(2), close to the mean-field rigidity percolation transition (r(t)=2.40). BS is a bulk probe of elasticity, and photosoftening is maximized here when network stress is minimized near the elastic phase transition.

引用

页码：245501 / 1

页数：4

共 36 条

[1] Rigidity transitions in binary Ge-Se glasses and the intermediate phase [J].