Oxygen concentration effect on T/sub c/ of the Bi-Ca-Sr-Cu-O superconductor
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
The T/sub c/ of Bi/sub 2/-Ca-Sr/sub 2/-Cu/sub 2/-O/sub 8-//sub x/ can be shifted reversibly over a rangel of at least 15 K by changing the oxygen concentration. T/sub c/ shifts downward for increased oxygen content. This is opposite to the shift seen in YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ and may be caused by reduction in the Fermi level reducing conductivity in the Bi-O layers. Oxygen concentration is varied by treatment in O/sub 2/ at appropriate pressures. The highest T/sub c/ = 78.5 K of the ''80-K'' phase is obtained by treating at 600 /sup 0/C in 10/sup -2/-bar oxygen. T/sub c/ shifts down to 65.4 K after treatment at 137 bars. The transitions remain sharp, with no evidence of significant structural change by x-ray powder diffraction. The original T/sub c/ is restored upon retreatment in O/sub 2/ at low partial pressure. The 110-K phase showed a much smaller shift (..delta..T/sub c/approx. =4 K) after treatment in O/sub 2/ at 134 bar.
- Research Organization:
- Physics Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
- OSTI ID:
- 6407799
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:10; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
FERMI LEVEL
HEAT TREATMENTS
HIGH PRESSURE
LOW PRESSURE
LOW TEMPERATURE
MEDIUM PRESSURE
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
QUANTITY RATIO
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VERY LOW TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
FERMI LEVEL
HEAT TREATMENTS
HIGH PRESSURE
LOW PRESSURE
LOW TEMPERATURE
MEDIUM PRESSURE
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
QUANTITY RATIO
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VERY LOW TEMPERATURE