Collective excitations in Ni62Nb38 glass from partial scattering functions
2004; Elsevier BV; Linguagem: Inglês
10.1016/s0921-4526(04)00544-7
ISSN1873-2135
Autores Tópico(s)Crystallography and Radiation Phenomena
ResumoThe inelastic neutron scattering intensity, I(E,Ω), for Ni62Nb38 metal glass has been measured over a wide range of scattering angles, Ω=13°–120° , and energy transfer, E=−10–+50 meV. Three samples with the same chemical composition and different Ni isotope content have been investigated. This allowed us to reconstruct three partial inelastic scattering functions INiNi(E,Ω), INbNb(E,Ω), and INiNb(E,Ω), according to the Ashcroft–Langreth formalism. The propagating excitations in a two-component amorphous alloy are the result of the superposition of three partial excitations. Each of these excitations is given by the corresponding partial atomic distribution. The “acoustic-phonon-like” dispersion relation is observed up to Q=6.5 A−1, which is the limit accessible in the present experiment.
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