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The linewidth of bulk plasmons in a rapid-quench Al₆Mn quasicrystal is found to increase by {~}40% as compared with that observed in a thermally annealed crystalline Al₆Mn sample. A narrower plasmon linewidth is also observed in a sputtered amorphous Al₆Mn thin-film sample. We believe that the unusual plasmon line broadening in Al₆Mn quasicrystals is a result of increased interband transitions due to the icosahedral symmetry of the quasicrystal, and not a consequence of lattice disorder.
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Chen et al. (1986) studied this question.
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