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  • 1
    Electronic Resource
    Electronic Resource
    Exponential temperature dependence of the critical transport current in Y-Ba-Cu-O thin films (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2370-2372 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the critical currents in rf-sputtered YBa2Cu3O7−x thin films deposited on polycrystalline yttria-stabilized zirconia substrates as a function of temperature down to 10 K. The dependence of the granular films at low temperature indicated exponential behavior which is similar to the superconductor-normal metal-superconductor (S-N-S) type tunneling junctions. For the films with a grain size of approximately 1 μm, we observed two exponential decay constants, which suggest that Josephson junctions limiting the transport critical current are possible both at the grain boundaries and at twin boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101531
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  • 2
    Electronic Resource
    Electronic Resource
    Decrease of the number of the isolated emission center Mn2+ in an aged ZnS:Mn electroluminescent device (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4253-4257 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We observed a decrease of the number of effective emission centers Mn2+ in the aged ZnS:Mn electroluminescence (EL) devices compared to the fresh EL devices using the electron-paramagnetic-resonance technique. Such phenomena can take place during the operation of the EL device, since the isolated Mn can easily diffuse into another site and forming cluster. Another possible explanation is that Mn2+ changes into Mn1+ or Mn3+ by transferring the electronic charge of the isolated Mn2+ to the neighboring Mn ions via sulfur and/or sulfur vacancy. As a result, luminance is lowered due to the decrease in the number of efficient emission centers of isolated Mn2+. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359887
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  • 3
    Electronic Resource
    Electronic Resource
    Luminescence and electron paramagnetic resonance studies of white-light emitting SrS: Pr, F thin film electroluminescent devices (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1754-1757 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fluorescence emission and excitation spectra of white-light emitting SrS: Pr, F thin film electroluminescent devices have been investigated. It was determined from the results obtained that the dominant electroluminescence mechanism was that the ionization of Pr3+ centers occurs first, then subsequently recombination with electrons occurs, and finally Pr3+ center transitions give rise to luminescence. The emission mechanism of SrS: Pr, F seems to be the same as that of a SrS: Pr, K electroluminescent device, except for the appearance of strong peaks around 610–670 nm. The impurity excitation peak in the lower excitation energy, longer-wavelength region in the FL spectrum may be an important factor for the selection of an effective white-light emitting EL material. The electron paramagnetic resonance experiment of SrS: Pr, F was performed on powder and thin film specimens. The hyperfine structure of an isolated Mn2+ ion was observed in this SrS: Pr, F thin film. This Mn center which was substituted for Sr, seems to contribute to the strong red emission in the white EL spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356366
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  • 4
    Electronic Resource
    Electronic Resource
    Photoresponse of a YBa2Cu3Ox grain-boundary junction (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3770-3773 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoresponse of a YBa2Cu3Ox grain-boundary junction has been measured as a function of chopping frequency and bias current in a temperature range of 2 K≤T≤70 K. The response was found to be mostly bolometric, but a nonbolometriclike component was also identified, which appeared as a chopping-frequency independent signal while immersing the sample in the superfluid helium. The bias-current dependence of the response showed a peak at a current corresponding to the critical current of the junction, and the peak values remained constant for 30 K≤T≤70 K. However, below 15 K the peak of the photoresponse increased very sharply with decreasing temperature following a 1/T3 dependence, consistent with the temperature dependence of the thermal boundary resistance between the film and the substrate. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361380
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  • 5
    Electronic Resource
    Electronic Resource
    Electron-paramagnetic-resonance study of the Mn2+ luminescence center in ZnS:Mn powder and thin films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1004-1007 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The number of isolated Mn2+ ions and Mn2+ clusters in ZnS:Mn powder and thin films has been studied using Mn2+ spectra measured at room temperature with an X-band electron-paramagnetic-resonance spectrometer. While the concentration of the isolated Mn2+ ions decreases with increasing Mn concentration, the concentration of the clusters increases. At low Mn concentration, the Mn2+ ion substitutes for the Zn ion in ZnS:Mn in the cubic phase. At high Mn concentrations, where the ZnS powder has a dominant hexagonal phase, the Mn ion still prefers to substitute for Zn in ZnS:Mn at the cubic site rather than at the hexagonal site. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360886
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of an interlayer on the emission characteristics of a white-light-emitting electroluminescent device with a Pr and Ce doubly doped ZnS phosphor layer (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8717-8724 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated light-emission characteristics of a white-light-emitting electroluminescent device with a doubly doped ZnS:Pr,Ce,F phosphor layer. We found that optimum codoping of Ce enhances the emission characteristics compared to the electroluminescent device with a singly doped ZnS:Pr,F layer. We also found that introducing an additional thin-insulating SixNy interlayer between the lower insulating layer and the phosphor layer significantly stabilizes the aging characteristics and improves the luminous efficiency. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362498
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  • 7
    Electronic Resource
    Electronic Resource
    Significant improvement in the surface smoothness of post-annealed Y-Ba-Cu-O thin films upon silver addition (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 856-858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the effect of silver addition on the surface quality of rf-sputtered Y-Ba-Cu-O thin films. The Y-Ba-Cu-O-Ag films appear to have very smooth surfaces even if the post-annealing step is employed. The surface roughness of our ex situ grown Y-Ba-Cu-O-Ag film, having a 10.3 wt. % of silver, is within ±1% of the film thickness, which is more than 10 times better than the value of a typical post-annealed high-temperature superconducting film without silver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346768
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  • 8
    Electronic Resource
    Electronic Resource
    Reduced water degradation of YBaCuO by Si3N4 protective coating (1990)
    Springer
    Journal of materials science 9 (1990), S. 967-969 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722190
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  • 9
    Electronic Resource
    Electronic Resource
    Enhancement in superconducting properties of Y-Ba-Cu-O thin films by post-annealing in an inert atmosphere (1992)
    Springer
    Journal of materials science 27 (1992), S. 5276-5280 
    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 Y-Ba-Cu-O superconducting thin films were produced byex situ r.f. magnetron sputtering. In the post-annealing procedure, several annealing conditions which were scheduled for heating rate and annealing atmosphere were tried systematically to determine major factors affecting the characteristics of post-annealed superconducting thin films. From the results of the study, it was found that the characteristics of the films are strongly dependent on the heating atmosphere rather than the heating cycle or heating time. Films with a high transition temperature were obtained by treatment in an argon atmosphere; this is considered to be attributable to the rapid atomic diffusion in tetragonal YBa2Cu3O7−x due to the high oxygen vacancy concentration and the expanded lattice in an inert atmosphere during heat treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403829
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  • 10
    Electronic Resource
    Electronic Resource
    Enhancement in superconducting properties of Y-Ba-Cu-O thin films by post-annealing in an inert atmosphere (1992)
    Springer
    Journal of materials science 27 (1992), S. 5276-5280 
    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 Y-Ba-Cu-O superconducting thin films were produced byex situ r.f. magnetron sputtering. In the post-annealing procedure, several annealing conditions which were scheduled for heating rate and annealing atmosphere were tried systematically to determine major factors affecting the characteristics of post-annealed superconducting thin films. From the results of the study, it was found that the characteristics of the films are strongly dependent on the heating atmosphere rather than the heating cycle or heating time. Films with a high transition temperature were obtained by treatment in an argon atmosphere; this is considered to be attributable to the rapid atomic diffusion in tetragonal YBa2Cu3O7−x due to the high oxygen vacancy concentration and the expanded lattice in an inert atmosphere during heat treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553404
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    Paper (German National Licenses)
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