Abstract
AbstractThe reduction in lattice specific heat due to light vanadium impurity atoms in gold crystals observed earlier by Star et al. is explained on the basis of a low concentration Green's function theory. A localized perturbation model which includes mass change at the impurity site as well as changes in the nearest neighbour force constants has been employed performing the calculations. Reasonable agreement with the experimental data in two (Au‐0.33 at% V and Au‐1 at% V) of the three dilute alloys is obtained. The mass defect contribution is only 20% of the changed specific heat and the remaining contribution is due to force constant changes. The main contributions to the changed specific heat is caused by even parity A1 g‐, E2 g‐, F2 g‐, and F1 g‐symmetry modes, a feature which is not usually observed in other defect‐induced physical properties.
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