Abstract
The low-temperature lattice specific heat of V - Ta and V - W dilute alloys have been explained successfully on the basis of low-concentration Green's-function theory. The effects due to change in mass at the impurity site and the changes in the closest radial an angular force constants for the impurity-host-crystal interactions have been taken into account. An enhancement in the lattice specific heat due to substitution of these impurities has been observed. The calculated results compare well with the experimental data. The main contributions to the changed specific heat are caused by even parity A 1g, Eg, F 1g and F 2g symmetry modes, a feature which is not usually observed in other defect-induced dynamical properties.
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