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Titolo:
LOW-FREQUENCY DYNAMICS IN AN OPTICAL STRONG GLASS - VIBRATIONAL AND RELAXATIONAL CONTRIBUTIONS
Autore:
TERKI F; LEVELUT C; PRAT JL; BOISSIER M; PELOUS J;
Indirizzi:
UNIV MONTPELLIER 2,LAB VERRES,UMR 5587,PL EUGENE BATAILLON,CASE 069 F-34095 MONTPELLIER FRANCE
Titolo Testata:
Journal of physics. Condensed matter
fascicolo: 19, volume: 9, anno: 1997,
pagine: 3955 - 3971
SICI:
0953-8984(1997)9:19<3955:LDIAOS>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIUM-RANGE ORDER; RAMAN-SCATTERING; NEUTRON-SCATTERING; BOSON PEAK; SUPERCOOLED LIQUIDS; AMORPHOUS SOLIDS; LIGHT-SCATTERING; FORMERS; TRANSITION; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
F. Terki et al., "LOW-FREQUENCY DYNAMICS IN AN OPTICAL STRONG GLASS - VIBRATIONAL AND RELAXATIONAL CONTRIBUTIONS", Journal of physics. Condensed matter, 9(19), 1997, pp. 3955-3971

Abstract

A detailed Raman and Brillouin scattering investigation on a strong glass over a wide range of temperature across the glass transition temperature T-g is presented. The aim of the study is to determine whetherthe low-frequency vibrational behaviour is correlated with the elastic properties. A careful comparison of several models is carried out inorder to determine the reliability of theoretical predictions devotedto the understanding of the dynamics of glass-forming systems. A clear correlation between the position of the boson peak and the hypersonic velocity in both polarizations is demonstrated; in particular, the connection is in better accordance if one considers the transverse velocity. On the other hand, the quasielastic Raman scattering has been analysed in terms of excitations directly coupled to the acoustic phonons. The correlation between the quasielastic Raman intensity and the hypersonic attenuation predicted for the low-temperature regime has beenfound to hold over a broad range below and above T-g. We found a strong correlation between the Raman features (at 10-50 cm(-1)) and the Brillouin data (at 1 cm(-1)), suggesting that the same mechanism is responsible for the vibrational dynamics within the 1-50 cm(-1) range. Moreover, we emphasize that the softening of the vibrational modes responsible far the boson peak occurs significantly below T-g, while an increase of the quasielastic intensity sets in, indicating some similaritybetween the origin of the boson peak and the origin of the growth of the quasielastic line.

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Documento generato il 02/12/20 alle ore 18:30:51