Communication: High-frequency acoustic excitations and boson peak in glasses: A study of their temperature dependence

被引：31

作者：

Ruta, B. ^{[1
]}

Baldi, G. ^{[1
,2
]}

Giordano, V. M. ^{[1
]}

Orsingher, L. ^{[3
]}

Rols, S. ^{[4
]}

Scarponi, F. ^{[5
]}

Monaco, G. ^{[1
]}

机构：

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

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

[3] Univ Trent, Dept Phys, I-38050 Trento, Italy

[4] Inst Laue Langevin, F-38042 Grenoble, France

[5] Univ Perugia, Dept Phys, I-06100 Perugia, Italy

来源：

JOURNAL OF CHEMICAL PHYSICS | 2010年 / 133卷 / 04期

关键词：

VIBRATIONAL EXCITATIONS; COMPRESSIONAL WAVES; FORMING LIQUIDS; SCATTERING; VELOCITY; PHONONS; ORIGIN; ROCKS;

D O I：

10.1063/1.3460815

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：

The results of a combined experimental study of the high-frequency acoustic dynamics and of the vibrational density of states (VDOS) as a function of temperature in a glass of sorbitol are reported here. The excess in the VDOS at similar to 4.5 meV over the Debye, elastic continuum prediction (boson peak) is found to be clearly related to anomalies observed in the acoustic dispersion curve in the mesoscopic wavenumber range of few nm(-1). The quasiharmonic temperature dependence of the acoustic dispersion curves offers a natural explanation for the observed scaling of the boson peak with the elastic medium properties. (C) 2010 American Institute of Physics. [doi:10.1063/1.3460815]

引用

页数：4

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