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  • 1
    Electronic Resource
    Electronic Resource
    Shape-resonant and many-electron effects in the S 2p photoionization of SF6 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4726-4736 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The core-level photoexcitation and photoionization of SF6 were studied in the vicinity of the resonances below and above the S 2p threshold. The decay channels of the S 2p→6a1g discrete excitation were characterized, with decay leading mostly to valence-shell satellites. The S 2p continuum data show an oscillatory asymmetry parameter β(S 2p) near threshold that is virtually identical to β(Si 2p) in SiF4. It also resembles—but differs from—theoretical curves for β(S 2p) in atomic sulfur and in SF6. Data at the feature assigned as an eg shape resonance indicate strong multielectron properties for this state, because a resonance in the S 2p satellite is observed at the same photon energy as the main-line resonance. We propose a unified model which generally includes configuration interaction both in the continuum-state manifold and between discrete doubly excited states and the continua, to explain this unexpected satellite behavior. Finally, the S(L2,3VV) Auger electron asymmetry parameter shows no significant deviation from zero near the t2g and eg shape resonances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455666
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reactive ion beam deposition of thin films in the bismuth-calcium-strontium-copper oxide ceramic superconductor system (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 2186-2187 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Reactive ion beam deposition has been used to grow c-axis-oriented superconducting thin films in the Bi-Ca-Sr-Cu-O (BCSCO) system around the cation ratio 1:1:1:1 on single-crystal (001) MgO. The films show a single superconducting transition with an initial onset near 85 K and a critical current of 5×104 A/cm2 at 10 K. Two different BCSCO-containing phases have been identified in the thin films: one with a tetragonal pseudo-body-centered subcell, c=24.4 A(ring), which is not superconducting above 28 K, and a second with c=30.6 A(ring), which is responsible for the superconductivity. Electron diffraction measurements on the 30.6 A(ring) phase are consistent with those previously reported for the bulk ceramic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99764
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  • 3
    Electronic Resource
    Electronic Resource
    Planar weak-link devices from YBaCuO and BiSrCaCuO films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2226-2228 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Weak-link devices were fabricated from polycrystalline thin films of YBaCuO and BiSrCaCuO. Two distinct types of weak links have been found in these devices. The first type, found in all of the YBaCuO and most of the BiSrCaCuO devices, has relatively low dynamic resistances and critical currents with nearly linear temperature dependences. The second type of weak links, found in some BiSrCaCuO films, has much larger dynamic resistances and critical current temperature dependences similar to that of a tunnel junction. Superconductivity quantum interference devices (SQUID's) fabricated from BiSrCaCuO showed a periodic response to applied fields that is consistent with the magnitude of the flux enclosed by the SQUID loop. Significant hysteresis was found in the SQUID response, apparently indicating flux penetration into the films at relatively low fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100509
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  • 4
    Electronic Resource
    Electronic Resource
    80–111 GHz quasi-optical measurement of the complex conductivities of YBa2Cu3O7 superconducting thin films (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1298-1300 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Complex conductivities of YBa2Cu3O7 high-temperature superconducting thin films were measured from 80 to 111 GHz using quasi-optical techniques. From transmission measurements, a peak was obtained in σ1 versus temperature. Measurements of the frequency dependence of this peak position found it shifted to higher temperatures with increasing frequency. The data for both σ1 and σ2, as a function of frequency, were fitted using a BCS/effective medium model. This fit indicates that the observed peak in σ1 is a result of the temperature dependence of the carrier mean free path combined with effects resulting from the granularity of the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108713
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  • 5
    Electronic Resource
    Electronic Resource
    55 GHz microstrip bandpass filter made from YBa2Cu3O7−x superconductor thin film (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2026-2028 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first mm wave passive component made with high temperature superconducting thin films. Microstrip bandpass filters, with bandwidth of 2.2 GHz and a center frequency of 55 GHz, were made using YBa2Cu3O7−x filter patterns on MgO substrates with Au ground planes. The best results were obtained for a film grown with a thin SrTiO3 buffer layer and had Tc=89 K and Jc=106 A/cm2 at 84 K. The filter showed insertion loss of 1.7 db at 77 K, and 1.5 db at 70 K, compared to 7.3 db for Au filters at 77 K. Subtracting the losses in the Au ground plane, we estimated that the superconductor surface resistance is lower than one fourth that of Au at 77 K and 55 GHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107132
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  • 6
    Electronic Resource
    Electronic Resource
    The effects of thin compressive films on indentation fracture toughness measurements (1989)
    Springer
    Journal of materials science 24 (1989), S. 1363-1367 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thin compressive films have been shown to decrease the lengths of radial cracks produced by a Vickers indentation in a variety of non-metallic materials. The intrinsic stress of submicrometre thick films deposited by reactive ion beam sputtering was measured by a cantilever technique. The change in the apparent indentation fracture toughness of the coated material was correlated with film thickness and stress, indentation load, and the nature of the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553167
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  • 7
    Electronic Resource
    Electronic Resource
    The effects of thin compressive films on indentation fracture toughness measurements (1989)
    Springer
    Journal of materials science 24 (1989), S. 1363-1367 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thin compressive films have been shown to decrease the lengths of radial cracks produced by a Vickers indentation in a variety of non-metallic materials. The intrinsic stress of submicrometre thick films deposited by reactive ion beam sputtering was measured by a cantilever technique. The change in the apparent indentation fracture toughness of the coated material was correlated with film thickness and stress, indentation load, and the nature of the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397072
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    Paper (German National Licenses)
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