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  • 1
    Electronic Resource
    Electronic Resource
    Platinum enhanced textured growth of grain-aligned YBa2Cu3O7−x thick films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5218-5226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of magnetic alignment, heat treatment, and substrate interactions on the microstructural development and properties of YBa2Cu3O7−x (Y123) thick films were studied. Aligned films were formed by vacuum filtrating a particulate suspension in a 7 T applied field. These films and nonaligned control films were fired on either platinum (Pt) foil or magnesium oxide (MgO) substrates to various maximum temperatures between 930 and 1040 °C. Optical microscopy revealed large differences in microstructural development between the various films. Aligned Y123 films fired on Pt foil exhibited the best microstructural properties. Via plasma emission spectroscopy and secondary ion mass spectroscopy, approximately 0.1 wt % Pt was found distributed throughout the films fired on platinum, while negligible amounts of Mg were detected in the films fired on MgO substrates. Differential thermal analysis revealed that, in the presence of Pt, the peritectic temperature (1030 °C for pure Y123 in O2) is reduced 70 °C, thereby opening a substantial thermal processing window for partial melt assisted growth of textured Y123. SQUID measurements of magnetic hysteresis and Tc provided quantitative evidence that, relative to the films fired on MgO, those fired on Pt exhibited enhanced texture development [ΔM(Happ(parallel)c axis)/ΔM(Happ⊥c axis)=2.6 at 5 K, 1 T] and properties (Bean model Jc,m=5×104 A/cm2 at 5 K, 4 T) without degradation of the Tc characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355719
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  • 2
    Electronic Resource
    Electronic Resource
    Substrate step-edge YBa2Cu3O7 rf SQUIDs (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 543-545 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a technique which permits high-yield fabrication of microbridges and low noise YBa2Cu3O7 superconducting quantum interference devices (SQUIDs) in epitaxial thin films. These SQUIDs operate over a wide temperature range extending from 4 K to close to the superconducting transition temperature. Measurements of an rf SQUID operating at 77 K give a peak-to-peak flux sensitivity of 36 μV/Φ0 and a flux noise at 10 Hz of 1.5× 10−4 Φ0/(square root of)Hz. Device yields over 80% have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104581
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  • 3
    Electronic Resource
    Electronic Resource
    Epitaxially grown sputtered LaAlO3 films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2019-2021 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown crystalline thin films of LaAlO3 using off-axis rf sputtering from a single stoichiometric target. The films grow epitaxially on SrTiO3 and LaAlO3 (100) substrates as well as on YBa2Cu3O7 thin films. We report on the growth conditions used to make these films, the properties of the films, and the properties of bilayer and trilayer structures containing both LaAlO3 and YBa2Cu3O7 films. Transmission electron microscopy cross-sectional and x-ray diffraction analyses indicate that all the constituent films in the multilayers grow epitaxially and that the interfaces between the films are sharply defined. Preliminary transport measurements on these multilayers show that LaAlO3 can be used for dielectric layers in a variety of high-temperature superconductor electronic circuits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104153
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  • 4
    Electronic Resource
    Electronic Resource
    Low-loss substrate for epitaxial growth of high-temperature superconductor thin films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2677-2679 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A perovskite-like single-crystal substrate material has been investigated that simultaneously permits epitaxial growth of 1-2-3 superconductor films and possesses desirable rf properties of low dielectric constant and loss tangent. The lattice constant of 3.792 A(ring) provides a lattice match to within 1% of the a axis of 1-2-3. Sputtered films of erbium-barium-copper-oxide have been produced on (100) LaAlO3 substrates that exhibit sharp resistive transitions at 90 K (ΔT=1K), bulk superconductivity as determined by ac susceptibility measurements, and nearly single-crystal growth as evidenced by x-ray diffraction and high-resolution scanning electron microscopy. The high-frequency dielectric properties of LaAlO3 were experimentally investigated at several temperatures. The low-frequency dielectric constant was measured to be 15 and the microwave loss tangent ranged from 6×10−4 at room temperature to 5×10−6 at 4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100543
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave surface impedance at 10 GHz and quasiparticle scattering in YBa2Cu3O7 films (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2274-2276 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface impedance of superconducting YBa2Cu3O7 films as a function of temperature at 10 GHz has been measured in a parallel plate resonator geometry. The penetration depth λ(T), complex microwave conductivity σ(T), and quasiparticle scattering rate 1/τ(T) were also determined. After a rapid fall as T is lowered below Tc, the surface resistance Rs exhibits a linear dependence from 65 K down to 6 K. As T drops below Tc, the real part of the conductivity σ1 has a rapid rise, which is attributed to the observed dramatic increase in τ. The normal-fluid density shows a linear behavior at low temperatures, which is inconsistent with s-wave BCS superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110527
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  • 6
    Electronic Resource
    Electronic Resource
    Platinum-enhanced densification of grain-aligned YBa2Cu3O7−x films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 103-105 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Grain-aligned YBa2Cu3O7−x films were fabricated by vacuum filtration in an applied magnetic field (7 T). Platinum (Pt) was shown to lower the peritectic temperature of YBa2Cu3O7−x by almost 75 °C, leading to dramatic microstructural differences between films densified on MgO (single crystal) substrates and those densified on Pt foil to a maximum temperature of 1020 °C in oxygen. Superconducting quantum-interference device hysteresis loops measured at 0–5.5 T at 5 K showed that films fired on Pt had ΔM (Happ(parallel)c axis) values 15–60 times larger than those fired on MgO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110907
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  • 7
    Electronic Resource
    Electronic Resource
    Electrical and magnetic transport properties of laser-deposited Ba1−xKxBiO3 thin films (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 480-482 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report measurements of the electrical and magnetic transport properties of high-quality superconducting Ba1−xKxBiO3 (BKBO) thin films grown by in situ pulsed laser deposition. The best films exhibit sharp resistance and magnetic transitions with zero resistance above 28 K and widths of 0.3 K, and nearly linear normal state resistance extending from the transition to above room temperature. Critical current densities obtained by transport in patterned BKBO lines are greater than 3×106 A/cm2 at 4 K. The transverse magnetoresistance exhibits predominantly BCS-like behavior with an upper critical field slope of −0.78 T/K near Tc, giving Hc2(0)=15.2 T and a BCS coherence length ξ=46 A(ring). We also observe substantial field broadening suggestive of flux flow dissipation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107863
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  • 8
    Electronic Resource
    Electronic Resource
    In situ pulsed laser deposition of superconducting Ba1−xKxBiO3 thin films (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1905-1907 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown superconducting thin films of Ba1−xKxBiO3 by in situ pulsed laser deposition from a stoichiometric (x=0.4) target. The best films exhibit an onset transition temperature of 28 K and have zero resistance as high as 26 K. Films are single phase and highly oriented in the (100) or (110) direction on MgO, SrTiO3, LaAlO3, and Al2O3 substrates. We have observed high-quality normal-insulator-superconductor and superconductor-insulator-superconductor quasiparticle tunneling characteristics with the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106184
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  • 9
    Electronic Resource
    Electronic Resource
    Multisource-sputtered ErBa2Cu3O7−x films on single-crystal and buffered crystalline substrates (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 313-326 
    Details
    ISSN: 1572-9605
    Keywords: Erbium-barium-copper-oxide ; sputtering ; buffered substrates ; multisource sputtering ; silicon substrates ; SNMS ; depth profiling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-quality superconducting films of erbium-barium-copper-oxide have been produced in a multisource sputtering system on a variety of substrates, including buffered sapphire and silicon wafers as well as various single-crystal materials. Fine-grained polycrystalline films with narrow (〈4 K) resistive transitions have been grown on a number of different substrates. The use of erbium in the 12–3 compound leads to improved film morphology and to more forgiving conditions for establishing of the superconducting phase. Sputtered neutral mass spectroscopy (SNMS) yields useful information about the compositional profile of the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617720
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  • 10
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    Insitupulsed laser deposition of superconducting Ba1−xKxBiO3thin films (1991)
    American Institute of Physics
    Details
    Publication Date: 1991-10-07
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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