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(165) Production(s) de RUFFLE B.
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Characterizations of piezoelectric GaPO4 single crystals grown by the flux method 
Auteur(s): Armand Pascale , Beaurain Marion, Ruffle B., Menaert Bertrand, Balitsky Denis, Clement S., Papet Ph
(Article) Publié:
Journal Of Crystal Growth, vol. 310 p.1455-1459 (2008)
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The vibrational excitations of glasses in the boson-peak region: application to borates
Auteur(s): Vacher R., Ruffle B., Hehlen B., Guimbretiere Guillaume, Simon Guilhem, Courtens E.
(Article) Publié:
European Journal Of Glass Science And Technology: Part B - Physics And Chemistry Of Glasses, vol. 49 p.19-25 (2008)
Ref HAL: hal-00512610_v1
Exporter : BibTex | endNote
Résumé: There exists a special interest in investigating acoustical and optical vibrations of glasses in the one THz frequency region. The main experimental tools that are used to this effect are briefly discussed. The current understanding of the boson-peak vibrations and of their resonance with acoustic branches are explained. Specific new results on the origin of the boson peak and on the end of acoustic branches are presented for borates.
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Boson peak and its relation to acoustic attenuation in glasses
Auteur(s): Ruffle B., Parshin D. a., Courtens E., Vacher R.
(Article) Publié:
Physical Review Letters, vol. 100 p.015501 (2008)
Ref HAL: hal-00512617_v1
Exporter : BibTex | endNote
Résumé: Experimental results on the density of states and on the acoustic modes of glasses in the THz region are compared to the predictions of two categories of models. A recent one, solely based on an elastic instability, does not account for most observations. Good agreement without adjustable parameters is obtained with models including the existence of nonacoustic vibrational modes at THz frequency, providing in many cases a comprehensive picture for a range of glass anomalies.
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Hypersound Damping in Vitreous Silica Measured by Picosecond Acoustics
Auteur(s): Devos A., Foret M., Ayrinhac Simon, Emery P., Ruffle B.
(Article) Publié:
Physical Review B, vol. 77 p.100201(R) (2008)
Ref HAL: hal-00512645_v1
Exporter : BibTex | endNote
Résumé: The attenuation of longitudinal acoustic phonons up to frequencies nearing 250 GHz is measured in vitreous silica with a picosecond optical technique. By taking advantage of interferences on the probe beam, difficulties encountered in early pioneering experiments are alleviated. Sound damping at 250 GHz and room temperature is consistent with relaxation dominated by anharmonic interactions with the thermal bath, extending optical Brillouin scattering data. Our result is at variance with claims of a recent deep-UV experiment which reported a rapid damping increase beyond 100 GHz. A comprehensive picture of the frequency dependence of sound attenuation in nu-SiO2 can be proposed.
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The Boson peak and its Relation with Acoustic Attenuation in Glasses
Auteur(s): Ruffle B., D Parshin, Courtens E., Vacher R.
Conference: XI International Workshop on Complex Systems (Andalo, IT, 2008-03-16)
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Mechanical Relaxation in Glasses below and at the Glass Transition Temperature
Auteur(s): Ruffle B.
Conférence invité: International Workshop on Glass and Entropy (Trencin, Slovakia, FR, 2008-06-22)
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High Frequency Sound in Glasses
Auteur(s): Ruffle B., D Parshin, Courtens E., Vacher R.
Conference: 22 nd General conference of the condensed matter division of the european physical society (Rome, Italy, FR, 2008-08-25)
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