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  • 1
    Electronic Resource
    Electronic Resource
    Heteroepitaxial YBa2Cu3O7−x-SrTiO3-YBa2Cu3O7−x trilayers examined by transmission electron microscopy (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 765-767 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report high-resolution transmission electron microscopy and electron diffraction studies of the heteroepitaxial superconductor-insulator-superconductor system YBa2Cu3O7−x-SrTiO3-YBa2Cu3O7−x deposited on polished (001)MgO substrates by in situ laser ablation. The resulting films grow epitaxially and consistently preserve a parallel orientation between the close-packed (001)YBa2Cu3O7−x planes and (001)SrTiO3 planes over the entire trilayer, even in the presence of ledges or steps along vicinal interfaces. Although the interface regions showed strain occasionally relieved by stacking faults, they were free of disorder and any evidence of impurity phases. The observed epitaxial growth is very likely responsible for the excellent electrical properties found in similarly constructed multilayer interconnects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104541
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Flux noise from superconducting YBa2Cu3O7−x flux transformers (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1106-1108 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a dc superconducting quantum interference device (SQUID) at 4.2 K, we have measured the magnitude and temperature dependence of the flux noise generated by superconducting flux transformers made from YBa2Cu3O7−x. If the transformer loop is opened, the observed noise decreases by a factor of 10, demonstrating that moving vortices generate noise primarily by altering the screening current, rather than by coupling their magnetic flux directly into the SQUID. Model calculations are given for the various noise contributions, and shown to be reasonable predictions of the observed effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104386
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Superconducting thin-film multiturn coils of YBa2Cu3O7−x (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2336-2338 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a technique for fabricating superconducting thin-film multiturn coils from the high-temperature superconductor YBa2Cu3O7−x. We have built 10-turn and 19-turn square spiral coils, 1 mm on a side, that are suitable for coupling to a thin-film dc superconducting quantum interference device. The coils are constructed with a three-layer crossover technology using SrTiO3 as an insulator. Each layer is deposited in situ with a pulsed excimer laser, and is patterned with shadow masks or photoresist and an Ar ion mill. The best coil had a transition temperature of approximately 82 K, and a critical current at 77 K of 1.4 mA, corresponding to a critical current density of 2×104 A cm−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103247
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Multilayer YBa2Cu3Ox-SrTiO3-YBa2Cu3Ox films for insulating crossovers (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 189-191 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe our procedure for fabricating YBa2Cu3Ox-SrTiO3-YBa2Cu3Ox thin-film trilayer structures. Each film is grown in situ by excimer laser deposition onto a heated (100)MgO substrate. The geometrical configuration of each layer is defined by a metal mask; the vacuum chamber is opened between depositions to allow the targets and masks to be changed. The lower and upper YBa2Cu3Ox films in the best trilayer structure had transition widths of 1 and 3 K (10–90%), respectively, and transition temperatures (zero resistance) of 87 K. The resistance between the YBa2Cu3Ox films at 77 K was 108 Ω for an overlapping area of 0.2 mm2, corresponding to a SrTiO3 resistivity of 4×109 Ω cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103281
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Second harmonic generation in LiTaO3 thin films by modal dispersion and quasi phase matching (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3695-3697 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Green light was generated by second harmonic generation in LiTaO3 thin films grown on sapphire. We describe the optical properties of the thin films grown by rf magnetron sputtering. We report on the experimental conditions for second harmonic generation by modal dispersion and quasi phase matching. For quasi phase matching, proton exchange was used to periodically deaden the nonlinearity of the crystal. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115976
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    Paper (German National Licenses)
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