Conduction properties of the hexagonal tungsten bronze, Rb/sub x/WO/sub 3/
Studies of the electrical transport properties: resistivity, Hall effect, and Seebeck coefficient: of the hexagonal tungsten bronze Rb/sub x/WO/sub 3/ for 0.16< or =x< or =0.33 are reported for the temperature range from 1.5 to 300 K. In the normal state, these properties show temperature-dependent anomalies which suggest a phase transition with temperature. The temperature at which this transition occurs is shown to depend on the Rb concentration, exhibiting a sharp maximum near x=0.25. As the Rb concentration is decreased below x = 0.33 the superconducting transition temperature first increases above the value of 1.94 K at x=0.33 and then decreases to less than 1 K at x=0.24. As the Rb concentration is lowered further a second increase in T/sub c/ is observed. This behavior appears to be associated with a phase transition at a composition near x=0.25. The nature of neither the transition with temperature nor the transition with concentration could be precisely determined. The superconducting state shows a large temperature-independent 60 /sup 0/ anisotropy in H/sub c/2 in the plane perpendicular to the hexagonal axis and positive curvature in the temperature dependence of H/sub c/2 near T/sub c/.
- Research Organization:
- Department of Physics, Florida State University, Tallahassee, Florida 32306
- OSTI ID:
- 5835020
- Journal Information:
- Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 20:5; 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
ANISOTROPY
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HALL EFFECT
HEXAGONAL LATTICES
LOW TEMPERATURE
MEDIUM TEMPERATURE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUANTITY RATIO
RUBIDIUM ALLOYS
RUBIDIUM COMPOUNDS
RUBIDIUM TUNGSTATES
SEEBECK EFFECT
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TUNGSTATES
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE