Sharma, H. R.; Franke, K. J.; Theis, W.; Gille, Peter; Ebert, P.; Rieder, K. H.
Low-energy surface phonons of decagonal and icosahedral quasicrystals by inelastic He-atom scattering.
In: Physical Review B, Vol. 68, No. 5
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Low-energy surface phonons (Rayleigh mode) on quasicrystals wereinvestigated by inelastic He-atom scattering. The tenfold surface ofdecagonal Al(71.8)Ni(14.8)Co(13.4) and the fivefold surface oficosahedral Al(70.5)Pd(21)Mn(8.5) are found to possess well-definedRayleigh modes with isotropic sound velocities of about 3840 m/s and3470 m/s, respectively. The observed sound velocities are in goodagreement with calculations based on the respective bulk data. Theexperimental phonon dispersions exhibit quasi-Brillouin-zone centerslocated at strong Bragg peaks.