Effect of compositional variation and annealing in oxygen on superconducting properties of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 8-//sub y/

Journal Article · Mon Jun 01 04:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.8774· OSTI ID:6511775

Panson, A J; Braginski, A I; Gavaler, J R; Hulm, J K; Janocko, M A; Pohl, H C; Stewart, A M; Talvacchio, J; Wagner, G R

Changes in the ratios of cations by --10% off the Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 8-//sub y/ composition demonstrated that a range of solid solutions exists in this material. The critical temperature within this range is strongly composition dependent and falls off from above 90 K to --70 K. Annealing stoichiometric samples in 1 bar of oxygen at 700/sup 0/C for 36 and 108 h resulted in narrowing of the magnetic susceptibility transition and significant increases in the critical current density J/sub c/, p-type effective carrier concentration n/sup */, and upper critical field, H/sub c//sub 2/. After annealing, J/sub c/ between 5 and 60 kOe was (3--1.5) x 10/sup 4/ A/cm/sup 2/ at 4.2 K and (2--0.5) x 10/sup 2/ A/cm/sup 2/ at 77 K. The value of n/sup */ after annealing was 4.2 x 10/sup 21/ cm/sup -3/. An extrapolated value of H/sub c//sub 2/(T = 0) = 1.2 MOe was obtained from chemically bonddH/sub c//sub 2//dTchemically bond = 19 kOe/K. A set of microscopic superconducting parameters was derived from results of resistive measurements made on a single, annealed specimen.

• Research Organization: Westinghouse R and D Center, Pittsburgh, Pennsylvania 15235
• OSTI ID: 6511775
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:16; ISSN PRBMD
• Country of Publication: United States
• Language: English

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
BARIUM COMPOUNDS
BARIUM OXIDES
CARRIER DENSITY
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
HEAT TREATMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
SCATTERING
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES