Inelastic neutron scattering measurements on single crystals of cubic NaₓWO₃ reveal a large concentration-dependent Kohn anomaly in the [100] longitudinal acoustic-phonon dispersion curve. The results demonstrate the two-dimensional character of the Fermi surface, support the rigid-band model for $0.56<x<0.83$, and conflict with the percolation model which has just recently been proposed to explain the transport properties of the tungsten bronzes.
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Kamitakahara et al. (1976) studied this question.
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