Abstract
Heat capacity measurements have been made in the temperature range 1-310 K for a phasonless perfect quasicrystal Al65Cu20Ru15, an Al65Cu20Ru15 quasicrystal with phason disorder, and a crystal approximant Al70Cu20Ru10. The electronic heat capacity of the perfect quasicrystal was found to be essentially zero. The existence of some excitation associated with an energy of about 1.6 meV is proposed. The vibrational properties of the quasicrystal are distinctly different from those of the crystal approximant in the region T < ThetaD/10, indicating that the densities of states are significantly different at the corresponding energies.
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