3 0 M ay 2 00 5 Continuum elastic sphere vibrations as a model for low-lying optical modes in icosahedral quasicrystals


The nearly dispersionless, so-called “optical” vibrational modes observed by inelastic neutron scattering from icosahedral Al-Pd-Mn and Zn-Mg-Y quasicrystals are found to correspond well to modes of a continuum elastic sphere that has the same diameter as the corresponding icosahedral basic units of the quasicrystal. When the sphere is considered as free… (More)

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