Inelastic neutron scattering study of acoustic modes in a monodomain AlCuFe quasicrystal

M. Quilichini , G. Heger , B. Hennion , S. Lefebvre , A. Quivy

Inelastic neutron scattering results evidenced for the first time that acoustic phonon modes can be observed for a quasicrystal. The triple-axes experiments have been performed on a small monodomain Al63Cu 25Fe12 sample. The obtained TA and LA dispersion curves near to strong Bragg peaks do not show any variation with respect to different Q values. Their slopes are isotropic and do not depend on special symmetry directions; they are comparable to those of corresponding curves for pure aluminium. We have not been able to observe energy gaps in our measurements.

Mots clés: aluminium alloys; copper alloys; iron alloys; lattice dynamics of metallic crystals; neutron diffraction examination of materials; phonon dispersion relations; quasicrystals

Domaines: Articles anciens

M. Quilichini, G. Heger, B. Hennion, S. Lefebvre, A. Quivy. Inelastic neutron scattering study of acoustic modes in a monodomain AlCuFe quasicrystal. Journal de Physique, 1990, 51 (17), pp.1785-1790. ⟨10.1051/jphys:0199000510170178500⟩. ⟨jpa-00212489⟩