DYNAMICAL PROPERTIES OF AMORPHOUS FE90-XCOXZR10 (X=10,40) ALLOYS

Inelastic neutron-scattering experiments on amorphous Fe90-xCoxZr10(x = 10 and 40) alloys have been performed. Generalized phonon densities of states (PDOS) were deduced from the measured time-of-flight spectra at room temperature. The results show that in the energy region below 17 meV, the generalized PDOS of the amorphous Fe80Co10Zr10 Invar allo y is obviously softer than that of the amorphous Fe50Co40Zr10 non-Inva r alloy. It is suggested that the softening of the low-energy PDOS in Invar alloys could be attributed to an enhancement of the electron-pho non interaction.