Inelastic neutron scattering measurements on the transverse acoustic and lowest optic modes in doped with lithium

Autor:	B. Hennion, R. S. Klein, G E Kugel
Rok vydání:	1996
Předmět:	Phonon Chemistry Dynamic structure factor Mineralogy chemistry.chemical_element Condensed Matter Physics Inelastic neutron scattering Neutron spectroscopy Polarizability General Materials Science Wave vector Lithium Atomic physics Anisotropy
Zdroj:	Journal of Physics: Condensed Matter. 8:1109-1121
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/8/9/004
Popis:	Two crystals of with 1% and 5% Li have been investigated by inelastic neutron scattering. The transverse acoustic and lowest optic modes have been measured in the [100] direction from room temperature down to 10 K. The wavevector dependences of the mode softening, damping and intensities are represented. The measured dispersions are analysed in the framework of an extended shell model assuming an anisotropic non-linear polarizability of the oxygen ion. On the basis of this model, structure factors are calculated and compared with measured phonon intensities. Conclusions on the influence of the lithium substitution on the non-linear character of the polarizability are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a275bbef19108d7832e3ae37e7b7bae8 https://doi.org/10.1088/0953-8984/8/9/004 Zobrazit plný text záznamu