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  • 1
    Electronic Resource
    Electronic Resource
    On the limiting factors of the critical current density in high-T c superconducting ceramics (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 391-394 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconducting ceramics ; critical current density ; Josephson vortices ; pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The temperature dependence of the critical current density at high temperatures and in weak applied magnetic field for YBa2Cu3O7−y ceramic samples with a pronounced granular character is analyzed. The experimental results can be explained in terms of thermally activated motion of the intergrain Josephson vortices at grain boundaries, which may be an indication that the actual limiting factor for the critical current density in ceramic samples results from a weak pinning force density for the intergrain vortices rather than from the weak-link quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617464
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    “Peak effect” in the magnetic field dependence of the transport critical-current density in high-T c superconducting ceramics (1991)
    Springer
    Journal of superconductivity 4 (1991), S. 423-427 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconducting ceramics ; transport critical-current density ; pinning ; demagnetization effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The maximum observed in the magnetic field dependence of the transport critical-current density of high-T c superconducting ceramics was analyzed. Transport critical current and magnetization measurements performed on Bi(Pb)-Sr-Ca-Cu-O bulk sintered samples allowed us to conclude that such a maximum may result from the influence of demagnetization effects at low applied field values and an increase of the intergrannular pinning at higher fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635859
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Collective pinning behavior of intergranular Josephson vortices and the intergranular irreversibility line of high-T c superconducting ceramics (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 143-146 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconducting ceramics ; Josephson vortices ; collective pinning ; collective creep ; intergranular irreversibility line
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The supercurrent-transport properties of YBa2Cu3O∼7 (Y∶123) polycrystalline bulk sintered samples with random grain orientation were thoroughly investigated. The dissipation process in these materials occurs due to intergranular flux motion, rather than by weak-link quenching. It was found that the model which takes into consideration collective creep of intergranular vortices is self-consistent in describing the low-voltage-level current-voltage characteristics and the intergranular irreversibility line of high-T c superconducting ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732256
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    Paper (German National Licenses)
    Fulltext
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