Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster: Glasses I (jointly with DY)

CPP 14.17: Poster

Tuesday, March 27, 2012, 18:15–20:15, Poster A

THz dynamics in glasses studied by means of Inelastic Neutron Scattering — •Nicolo’ Violini — Jülich Center of Neutron Scattering, Forschungszentrum Jülich, D-52425 Jülich, Germany — Dipartimento di Fisica, Universitá di Perugia, Via A. Pascoli, I-06123, Perugia, Italy

The THz dynamics of two different glasses has been studied by means of Inelastic Neutron Scattering: the germanium diselenide (v-GeSe2) [1], an amorphous glass belonging to the family of continuous random network forming glasses and the glucose (C6H12O6). In both cases two well-defined peaks are resolved in the dynamic structure factor in a broad Q region, below and above the position of the first sharp diffraction peak in the static structure factor. Their common characteristics and possible differences will be discussed during the talk. The presence of two pseudo-branches in glasses seems to be quite general, but their nature is not completely understood, mainly due to the lack of theoretical models able to provide a complete description of this intriguing features[3].

[1] L. Orsingher, G. Baldi, A. Fontana, L. E. Bove, T. Unruh, A. Orecchini, C. Petrillo, N. Violini and F. Sacchetti Phys. Rev. B 82, 115201 (2010).

[2] N. Violini and F. Sacchetti, paper in preparation (unpublished).

[3] N. Violini, PhD Thesis (2011).