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The specific heat of Nb₃Sn has been measured over the temperature range 1-42^, and in magnetic fields up to 52. 5 kG. The data can be interpreted to give =13. 1 mJ/g atom ^K^2, {T₂}=2. 4, H₀=5350 G, and (T₂) =21. 7. The Debye temperature appears to increase at the rate of 1^/^ over most of the range of the measurements, with (0) =228^K. Measurements have also been made on a sample of composition Nb₄Sn, and on vapor-grown Nb₃Sn similar to that exhibiting the cubic-tetragonal lattice transformation. The specific heat of Nb₃Sn can be reconciled with elastic-constant data only if it is assumed that the lattice softening implied by the decreasing velocity of sound with decreasing temperatures is limited to frequencies considerably below the Debye frequency.
Vieland et al. (Sat,) studied this question.
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