Communication: Are metallic glasses different from other glasses? A closer look at their high frequency dynamics

被引：4

作者：

Bruna, P. ^{[1
]}

Baldi, G. ^{[2
,3
]}

Pineda, E. ^{[4
]}

Serrano, J. ^{[5
]}

Suck, J. B. ^{[6
]}

Crespo, D. ^{[1
]}

Monaco, G. ^{[7
]}

机构：

[1] UPC, Dpt Fis Aplicada, E-08860 Castelldefels, Spain

[2] UOS Roma, IPCF CNR, I-00185 Rome, Italy

[3] U Parma, Dpt Fis, I-43124 Parma, Italy

[4] UPC, ESAB, Dpt Fis & Eng Nucl, E-08860 Castelldefels, Spain

[5] UPC, ICREA Dpt Fis Aplicada, E-08860 Castelldefels, Spain

[6] U Tech Chemnitz, Inst Phys, D-09107 Chemnitz, Germany

[7] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

JOURNAL OF CHEMICAL PHYSICS | 2011年 / 135卷 / 10期

关键词：

THERMAL-CONDUCTIVITY; TRANSVERSE PHONONS; BOSON PEAK; SOLIDS; HEAT;

D O I：

10.1063/1.3640002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using high resolution inelastic x-ray scattering we studied the collective dynamics of the Pd(77)Si(16.5)Cu(6.5) metallic glass, focusing on the energy-momentum region where the boson peak appears. The dispersion relation and the width of the acoustic excitations are determined showing how the longitudinal acoustic modes maintain their dispersive character for frequencies well above the boson peak frequencies. Moreover, we prove that close to these frequencies there is a softening of the apparent sound speed indicating a failure of the Debye continuum approximation at the boson peak frequencies and challenging previous results on other metallic glasses. (C) 2011 American Institute of Physics. [doi:10.1063/1.3640002]

引用

页数：4

共 25 条

[1] Sound Attenuation at Terahertz Frequencies and the Boson Peak of Vitreous Silica [J].