J. Phys. I France
Volume 2, Number 8, August 1992
Page(s) 1553 - 1557
DOI: 10.1051/jp1:1992221
J. Phys. I France 2 (1992) 1553-1557

Specific-heat measurements in phason-strained quasicrystalline AlFeCu

K. 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.

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