Resonant Perturbation of Phonons in Cu(Au) Alloys Studied by Neutron Scattering

Autor:	W. A. Kamitakahara, E. C. Svensson
Rok vydání:	1971
Předmět:	Physics Condensed matter physics Phonon Alloy General Physics and Astronomy chemistry.chemical_element Perturbation (astronomy) Inelastic scattering engineering.material Neutron scattering Copper chemistry Impurity engineering Neutron
Zdroj:	Canadian Journal of Physics. 49:2291-2306
ISSN:	1208-6045 0008-4204
DOI:	10.1139/p71-279
Popis:	The atomic vibrations in single crystals of Cu(Au) alloys containing 1, 3, and 9 at.% Au have been studied by means of neutron inelastic scattering. Measurements have been carried out for the [00ζ]T and [ζζ0]T1 branches of all three alloys and also for the [00ζ]L branch of the 9% alloy. In general, the impurity-induced widths, Γ, and the shifts, Δ, from the corresponding frequencies for pure copper exhibit definite resonance behavior. The detailed behavior of Δ and Γ as functions of frequency is, however, generally not in good agreement with calculations based on a mass-defect theory valid only for low impurity concentration. From the observed behavior of Δ and Γ for different branches and impurity concentrations, we conclude that, although the large mass change is undoubtedly the most important factor, force-constant changes and concentration effects also play important roles in determining the details of the resonance behavior in Cu(Au) alloys.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b8c2ad882ca3004ee8b120aeb38b2753 https://doi.org/10.1139/p71-279 Zobrazit plný text záznamu