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- W2044963752 abstract "The phonon dispersion curves of nonstoichiometric ${mathrm{Nb}}_{3}$Ge (${T}_{c}$=6 K) have been investigated by inelastic neutron scattering. Despite the small size of the sample (0.1 ${mathrm{cm}}^{3}$) most of the branches along the main symmetry directions, including the highest-energy modes, have been determined. No drastic anomalies were observed and temperature effects were found to be small. The results can be well described by a Born--von K'arm'an model with axially symmetric forces up to the seventh-nearest neighbors. In a search for electron-phonon coupling effects our results for ${mathrm{Nb}}_{3}$(${mathrm{Ge}}_{0.8}$${mathrm{Nb}}_{0.2}$) are compared to previous results obtained on the low-${T}_{c}$ compound ${mathrm{Nb}}_{mathrm{c}}$Sb (${T}_{c}$ensuremath{simeq}0.2 K). The major differences between the lattice dynamics of the two compounds were found to be (i) a reduction of the Nb-Ge interaction by 35% compared to the Nb-Sb interaction and (ii) the low frequency of modes in ${mathrm{Nb}}_{3}$(${mathrm{Ge}}_{0.8}$${mathrm{Nb}}_{0.2}$) which involve a ``buckling'' of the Nb chains." @default.
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- W2044963752 date "1985-06-15" @default.
- W2044963752 modified "2023-09-26" @default.
- W2044963752 title "Phonon dispersion curves of nonstoichiometricNb3Ge" @default.
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- W2044963752 doi "https://doi.org/10.1103/physrevb.31.7772" @default.
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