Study of the lattice dynamics of hexagonal close-packed3He and4He using inelastic x-ray scattering

Autor:	R. O. Simmons, Eberhard Burkel, D. A. Arms, C. Seyfert, H. Sinn
Rok vydání:	1999
Předmět:	Physics Quasielastic scattering Condensed matter physics Phonon scattering Scattering Dynamic structure factor General Materials Science Inelastic scattering Neutron scattering Condensed Matter Physics Small-angle neutron scattering Inelastic neutron scattering
Zdroj:	Journal of Physics: Condensed Matter. 11:3501-3511
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/11/17/308
Popis:	We present the first measurement of the coherent dynamic structure factor S(Q,) of solid 3He. At a density of 13.25(10) cm3 mol-1, we observed longitudinal phonons, using high-resolution inelastic x-ray scattering at momentum transfers 6 nm-1 < |Q| < 23 nm-1. Their dispersion relation was determined along the c-axis in single crystals of hcp 3He, and the spectra were described with a single-phonon model. For comparison, hcp 4He at the same density was studied with the same technique. The comparison, including all available 4He data from neutron scattering experiments, results in a phonon frequency ratio 3/4 of 1.11(5). Special attention is given to the scattering contribution due to multi-phonon excitations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2ecf3ec89983769d1dcae75c64d4b78c https://doi.org/10.1088/0953-8984/11/17/308 Zobrazit plný text záznamu