Abstract
Abstract For an icosahedral system, phason-strain fields can be classified into two classes, transforming respectively under the Γ 4 and Γ 5 irreducible representations of the icosahedral group. Group theory predicts that the Γ 4 phason-strain field, as the one observed in as-cast quasicrystalline AlLiCu samples, is not coupled to phonon modes. The low temperature specific heat of AlLiCu samples was measured after 10 days of annealing which allows phason-strain elimination and leads to almost perfect samples. No vibrational contribution evolution is observed. Some consequences and implications are discussed.
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