J. Phys. I France 2 (1992) 1553-1557
Specific-heat measurements in phason-strained quasicrystalline AlFeCuK. Wang1, C. Scheidt1, P. Garoche1 and Y. Calvayrac2
1 Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay Cedex, France
2 CECM/CNRS, 15 rue G. Urbain, 94407 Vitry Cedex, France
(Received 7 April 1992, accepted 4 June 1992)
We measured the low temperature specific-heat on phason-strained and phason-free samples of the quasicrystalline Al 62Cu 25.5Fe 12.5 alloy. A strong enhancement of the vibrational contribution is observed for the phason-strained sample. This clearly indicates a softening of low-energy phonon modes, which allows us to deduce a decrease of the elastic shear modulus induced by phason strains.
© Les Editions de Physique 1992