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), Vol. 20:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
RUBIDIUM TUNGSTATES
ANISOTROPY
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
HALL EFFECT
SEEBECK EFFECT
SUPERCONDUCTIVITY
HEXAGONAL LATTICES
LOW TEMPERATURE
MEDIUM TEMPERATURE
QUANTITY RATIO
RUBIDIUM ALLOYS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
ALKALI METAL COMPOUNDS
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RUBIDIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TUNGSTATES
360603* - Materials- Properties
656102 - Solid State Physics- Superconductivity- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena- (-1987)