Thermoelectric power of Ba sub 1 minus x K sub x BiO sub 3
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (USA)
- Max-Planck-Institut fuer Festkoerperforschung, Postfach 80 06 65, D-7000 Stuttgart 80, (Germany) Department of Physics, Victoria University of Wellington, P.O. Box 600, Wellington, (New Zealand)
We report measurements of thermoelectric power of two superconducting samples of Ba{sub 1{minus}{ital x}}K{sub {ital x}}BiO{sub 3} with differing resistivity behaviors. The thermopower is negative between 50 and 300 K. We find in both samples an unusual temperature dependence similar to that in high-oxygen-content samples of Y-Ba-Cu-O with negative thermopower, suggesting a common mechanism producing this behavior in Ba{sub 1{minus}{ital x}}K{sub {ital x}}BiO{sub 3} and the Cu-O-plane superconductors. Our sample with an activated temperature dependence of resistivity shows a change to positive thermopower before becoming superconducting, possibly due to the effect of nonmetallic grain boundaries.
- OSTI ID:
- 5490672
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
ELECTRICITY
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMOELECTRICITY