|
|||||
|
|
Coupled rotational and translational modes in the mixed molecular crystal KBr1−x (CN) x |
|
| Authors: | A. Loidl R. Feile K. Knorr B. Renker J. Daubert D. Durand J. B. Suck |
| Affiliation: | 1. Institut für Physik, Universit?t Mainz, Jakob-Welder-Weg 11, D-6500, Mainz, W.-Germany 2. Institut für Angewandte Kernphysik, Kernforschungszentrum Karlsruhe, Postfach 3640, D-7500, Karlsruhe, W.-Germany 3. Physik Department, TH München, D-8046, Garching, W.-Germany 4. Faculté des Sciences, Universite de Metz, F-57000, Metz, France 5. Institut Max von Laue-Paul Langevin, F-38042, Grenoble, France |
| Abstract: | TheE g andT 2g acoustic phonon modes of the molecular crystals KBr0.96(CN)0.04 and KBr0.86(CN)0.14 have been investigated by inelastic neutron scattering at 6, 90 and 300 K. Clear resonances due to mode-mode coupling to molecular excitations were observed. In complementary ultrasonic experiments the elastic constants were found to pass through minima as a function of temperature. The results were quantitavely explained by a model which assumes simple forms of the molecular excitation spectrum. An alternative interpretation, though being only qualitative, postulates a freezing of the CN molecules into a glass-like phase. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |