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  • American Institute of Physics (AIP)  (3)
  • 1985-1989  (3)
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Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Preparation and substrate reactions of superconducting Y-Ba-Cu-O films (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1027-1029 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multiple metal-target dc magnetron sputter deposition of a metallic YBa2Cu3 alloy in pure Ar followed by ex situ oxygen annealing was used to prepare superconducting films on various substrates. This work particularly examines film-substrate reactions which are degrading to superconductivity. Better superconductors were obtained using predeposited buffer layers, notably on cubic zirconia and MgO substrates covered with Ag and Nb. Best films have Tc=80 K, metallic resistivities with resistance ratio(approximately-greater-than)2, and critical current density (approximately-less-than)10 kA cm−2 at 4.2 K. Normal-state resistivity measurements were made for O2 furnace temperatures up to 850 °C. Procedures for lithographically patterning these films are also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98819
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anisotropic critical current density in superconducting Bi2Sr2CaCu2O8 crystals (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 72-74 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Critical current densities and resistivities were measured in a single crystal of the high Tc superconductor Bi2Sr2CaCu2O8 within the ab basal plane ((parallel)) and along the c direction (⊥). A large anisotropy in critical current density is found, Jc(parallel)/Jc⊥≈103, in quantitative agreement with the large normal-state resistivity anisotropy near Tc. The data provide strong evidence for a two-dimensional layered structure of metallic planes separated by semi-insulating barriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101437
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Penetration depths of high Tc films measured by two-coil mutual inductances (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 2165-2167 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A fundamental parameter of sample quality in epitaxial films of high Tc oxides is the effective penetration depth λ(parallel) of the superconducting sheet. A contactless audio-frequency method is described, in which an epitaxial YBa2Cu3O7 film is sandwiched between sets of stacked coils, and the procedure is given for computing the complex sheet impedance and hence λ(parallel) from the change in mutual inductance produced by screening currents in the film. Temperature dependence of the complex impedance is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99757
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    Paper (German National Licenses)
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