Granular superconductivity in R/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub delta/ thin films

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.7125· OSTI ID:7090303

England, P; Venkatesan, T; Wu, X D; Inam, A

Present methods of fabricating thin films and bulk samples of the high-T/sub c/ oxide superconductor R/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub delta/ frequently produce a granular morphology with stochiometric grains separated by weakly superconducting material, Josephson, or proximity effect junctions. In these films, the bulk superconducting properties (transition width, critical current density) are controlled primarily by the strength of coupling between the grains and not by the superconductivity of the grains themselves. We have examined the I-V characteristics of thin-film oxide superconductors as a function of temperature and find evidence for a coherence transition in which isolated grains couple to form a bulk superconductor. The transition manifests itself in the scaling behavior Vapprox.(I-I/sub c/)/sup x/ where x changes abruptly at coherence. The magnetotransport is in support of the model.

• Research Organization: Bell Communications Research, 331 Newman Springs Road, Red Bank, New Jersey 07701
• OSTI ID: 7090303
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 38:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRITICAL CURRENT
MAGNETORESISTANCE
TRANSITION TEMPERATURE
COPPER OXIDES
ERBIUM OXIDES
EUROPIUM OXIDES
YTTRIUM OXIDES
ELECTRIC CONDUCTIVITY
FABRICATION
GRANULAR MATERIALS
STOICHIOMETRY
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
FILMS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity