The boson peak in amorphous silica: Results from molecular dynamics computer simulations

被引：6

作者：

Horbach, J ^{[1
]}

Kob, W ^{[1
]}

Binder, K ^{[1
]}

机构：

[1] Univ Mainz, Inst Phys, D-55099 Mainz, Germany

来源：

NEUTRONS AND NUMERICAL METHODS-N(2)M | 1999年 / 479卷

关键词：

D O I：

10.1063/1.59458

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：

We investigate a prominent vibrational feature in amorphous silica, the so-called boson peak, by means of molecular dynamics computer simulations. The dynamic structure factor S(q, nu) in the liquid, as well as in the glass state, scales roughly with temperature, in agreement with the harmonic approximation. By varying the size of the system and the masses of silicon and oxygen we show that the excitations giving rise to the boson peak are due to the coupling to transverse acoustic modes.

引用

页码：136 / 141

页数：6

共 11 条

[1] Evidence of high frequency propagating modes in vitreous silica
Benassi, P
Krisch, M
Masciovecchio, C
Mazzacurati, V
Monaco, G
Ruocco, G
Sette, F
Verbeni, R
[J]. PHYSICAL REVIEW LETTERS, 1996, 77 (18) : 3835 - 3838
[2] LOW-FREQUENCY MODES IN VITREOUS SILICA
BUCHENAU, U
PRAGER, M
NUCKER, N
DIANOUX, AJ
AHMAD, N
PHILLIPS, WA
[J]. PHYSICAL REVIEW B, 1986, 34 (08): : 5665 - 5673
[3] High frequency sounds waves in vitreous silica
Dell'Anna, R
Ruocco, G
Sampoli, M
Viliani, G
[J]. PHYSICAL REVIEW LETTERS, 1998, 80 (06) : 1236 - 1239
[4] Scattering investigation of acoustic localization in fused silica
Foret, M
Courtens, E
Vacher, R
Suck, JB
[J]. PHYSICAL REVIEW LETTERS, 1996, 77 (18) : 3831 - 3834
[5] GALPERIN YM, 1988, ZH EKSP TEOR FIZ, V67, P2386
[6] The dynamics of supercooled silica: acoustic modes and boson peak
Horbach, J
Kob, W
Binder, K
[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1998, 235 : 320 - 324
[7] HORBACH J, 1998, THESIS U MAINZ
[8] LOW-FREQUENCY RAMAN-SCATTERING ON DIFFERENT TYPES OF GLASS FORMERS USED TO TEST PREDICTIONS OF MODE-COUPLING THEORY
ROSSLER, E
SOKOLOV, AP
KISLIUK, A
QUITMANN, D
[J]. PHYSICAL REVIEW B, 1994, 49 (21) : 14967 - 14978
[9] Harmonic vibrational excitations in disordered solids and the "boson peak"
Schirmacher, W
Diezemann, G
Ganter, C
[J]. PHYSICAL REVIEW LETTERS, 1998, 81 (01) : 136 - 139
[10] Phonons in vitreous silica: Dispersion and localization
Taraskin, SN
Elliott, SR
[J]. EUROPHYSICS LETTERS, 1997, 39 (01): : 37 - 42

← 1 2 →