Structure and superconductivity in alkali tungsten bronzes
The anomalous concentration dependence of the superconducting transition temperature of alkali tungsten bronzes M/sub x/WO/sub 3/ is shown to be consistent with electron pairing induced by exchange of acoustic plasmons. Structural changes in these metals yield significant band-structure splitting which is shown to be essential to the formation of well-defined acoustic-plasmon branches in the dielectric function. Our results explain why cubic H/sub x/MO/sub 3/ is not superconducting even for large metallic densities x ..-->.. 1, and furthermore, demonstrate that the hexagonal phase is favorable to superconducting pairing in agreement with experiments on Rb/sub x/WO/sub 3/ and Cs/sub x/WO/sub 3/. Possible neutron and Brillouin scattering experiments are proposed to directly measure the acoustic-plasmon dispersion and damping.
- Research Organization:
- Physics Department, University of Virginia, Charlottesville, Virginia 22901
- OSTI ID:
- 6260450
- Journal Information:
- Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 19:11; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
HEXAGONAL LATTICES
PHYSICAL PROPERTIES
QUANTITY RATIO
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TUNGSTEN ALLOYS
TUNGSTEN BRONZE