Abstract
The enhancement in low temperature specific heat due to tin impurities in copper metal has been calculated. A defect perturbation model which includes changes in nearest neighbour central and noncentral force constants along with the mass changes in nearest neighbour central and noncentral force constants along with the mass change has been considered. The contribution of isotopic impurities to the enhanced lattice specific heat is about 22%. A comparison of the calculated values with the experimental results shows good agreement. The enhanced lattice specific heat due is very much sensitive to force constant changes. It is observed that the specific heat due to F1u-symmetry modes dominate over all other symmetry modes. The contributions from F1g-, F2g-, E2g-, and A1g- irreducible representations are also seen to be quite significant.
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