Anharmonic dynamical behaviour in bcc zirconium |
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Authors: | O Dubos W Petry J Neuhaus B Hennion |
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Institution: | Physik Department E 13, Technische Universit?t München, Garching, Germany Laboratoire Léon Brillouin, CEN Saclay, France
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Abstract: | We present inelastic neutron scattering measurements of the low energy and strongly damped phonons in the high temperature
bcc phase of zirconium. These phonons were investigated at different scattering vectors but equivalent phonon wave vectors in different Brillouin zones or along different but equivalent paths in the same Brillouin zone. Neither the observed differences
in intensity nor in line shapes can be explained by the coherent one-phonon scattering law . This leads to an apparent violation of the fundamental symmetry of lattice dynamics. Taking into account the strong anharmonicity
of these phonons, interferences between one- and multi-phonon scattering are held responsible for these effects. Measurements
in different scattering planes reveal that due to the symmetry of the bcc lattice, these effects can only be observed in certain
directions.
Received: 24 December 1997 / Received in final form: 9 March 1998 / Accepted: 19 March 1998 |
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Keywords: | PACS 63 20 Ry Anharmonic lattice modes - 63 20 Dj Phonon states and bands normal modes and phonon dispersion |
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