Abstract
Inelastic neutron scattering measurements of symmetry-direction phonon dispersion curves at room temperature in two Zr-Nb alloys and in a Zr-Nb-Mo alloy are presented along with their low-temperature specific heats and superconducting transition temperatures. The phenomenological charge-fluctuation model (CFM) is used to fit the curves and to generate the phonon density of states for each sample. Moments of this distribution along with ${T}_{c}$ and ${N}_{\mathrm{bs}}(0)$ are used to determine $〈{I}^{2}〉$ for comparison with Butler's rigid-muffin-tin calculations. Although numerical agreement is not expected and does not occur, nevertheless the general trend around Nb is reproduced. An analysis of the longitudinal-phonon contribution to $\ensuremath{\lambda}$ on the basis of the CFM is presented. Finally the Zr-Nb-Mo alloy is found to behave in detail like a Nb-Mo alloy of the same electron-peratom ratio both in its dispersion curves and in other properties indicating the importance of this parameter.
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