Zusammenfassung
A small permanent magnet (spherical shape, radius 0.1mm) is levitating inside a superconducting parallel plate capacitor made of YBCO thin films. The nonlinear damping of the translational oscillations of the magnet is investigated as a function of amplitude and temperature. The dissipation is found to be orders of magnitude lower than in bulk YBCO samples at small amplitudes. With increasing ...
Zusammenfassung
A small permanent magnet (spherical shape, radius 0.1mm) is levitating inside a superconducting parallel plate capacitor made of YBCO thin films. The nonlinear damping of the translational oscillations of the magnet is investigated as a function of amplitude and temperature. The dissipation is found to be orders of magnitude lower than in bulk YBCO samples at small amplitudes. With increasing amplitude the dissipation becomes exponentially large. We attribute our results to thermally activated flux creep in the YBCO thin films assuming a linear current dependence of the pinning barriers.
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