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  • Articles  (3)
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  • flux pinning  (3)
  • 1990-1994  (3)
  • 1945-1949
  • 1992  (3)
  • Electrical Engineering, Measurement and Control Technology  (3)
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  • Articles  (3)
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  • 1990-1994  (3)
  • 1945-1949
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  • Electrical Engineering, Measurement and Control Technology  (3)
  • Physics  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Quasistatic field responses of fluxoids in an Y1Ba2Cu3O7−δ film (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 47-53 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductor ; fluxoid ; quasistatic magnetic field ; flux pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The quasistatic magnetic field responses (typically 0.8 Hz) of fluxoids in ac-axis oriented Y1Ba2Cu3O7−δ (Y123) film have been studied using a computerized mechanical pendulum at 77 K. The resonance frequence of the pendulum is significantly shifted to higher values due to the interaction between the Y123 film and a magnet mounted on the pendulum. The contribution of the magnet-superconductor interaction to the shift of the squared resonance frequency shows, in a certain range, a logarithmic dependence on the driving force (proportional to the amplitude). The present results are consistent with the previous studies on the bulk Y123 materials for different configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617996
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Study of flux motion in Bi-based superconductors by a pendulum (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 127-135 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductor ; fluxoid ; magnetic stiffness ; flux pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Using a computerized mechanical pendulum, we have studied the lateral magnetic flux motion of the Bi-based high-T c superconductors in the quasi-static magnetic field (0.1 Hz) for the range 1 μm to 0.35 mm. The effect of d.c. and a.c. transport currents on the flux motion has also been investigated. We argue that the lateral magnetic stiffness is a measure of the pinning potential of the fluxoids in the superconductors. The pinning energy barrierε is estimated to be about 0.3 eV based on the stiffness measurements, which is comparable with the data from the YBa2Cu3O7−χ superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618056
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of flux flow, flux pinning, and flux creep upon the rf surface impedance of type-II superconductors (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 313-318 
    Details
    ISSN: 1572-9605
    Keywords: Surface impedance ; complex penetration depth ; flux flow ; flux pinning ; flux creep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The presence of vortices is known to have an important effect upon the rf surface impedanceZ s of type-II superconductors. In this paper we summarize a new theoretical approach that permits the influence of flux flow, flux pinning, and flux creep uponZ s =R s -iX s to be calculated over a wide range of angular frequenciesω, magnetic inductionsB, and temperaturesT. The normal-fluid excitations and the nonlocality of vortex-generated fields are also accounted for. The physics is conveniently described in terms of a complex penetration depthλ(ɛ, B, T), to which the surface impedance is related viaZ s = −iμ 0ɛλ(ω,B,T). We limit our attention to the linear response of the superconductor in the low-rf-power regime for which the surface impedance is power-independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618130
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    Paper (German National Licenses)
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