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  • 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)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Amplitude-dependent magnetic stiffness of melt-quenched YBa2Cu3O7−δ superconductors (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 307-314 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductor ; levitation ; magnetic stiffness ; flux pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Experimental results are reported on the differential levitation forces (magnetic stiffness) between permanent rare-earth magnets and high-temperature superconductors. Using a clamped beam cantilever, the amplitude-dependent magnetic stiffness for five configurations of the test magnets has been investigated for the melt-quenched YBa2Cu3O7-δ(Y123) superconductors in a range of 1 μm−1 mm. The configuration where the moment of the magnet and the direction of motion are perpendicular to the upper surface of the superconductor has the highest stiffness value among the five configurations. Compared with the data from a sintered Y123 superconductor, the magnetic stiffness for the melt-quenched materials has a much higher value and a much weaker dependence on the oscillation amplitudes. The results are compared with the current experimental and theoretical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732385
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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