Special phonons and superconductivity in the hexagonal tungsten bronzes
1979
Neutron scattering measurements on single crystals of hexagonal tungsten bronzes M/sub 0.33/WO/sub 3/ reveal low-frequency, relatively dispersionless phonon branches which can be associated with the vibrations of the metal atoms M in the large open channels they occupy in the crystal structure. An analysis based on Eliashberg theory shows that the strong dependence of the superconducting transition temperature on the species M arises from these special phonons.
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