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Damping of a levitating magnetic microsphere by vortex motion in YBCO

Grosser, R. ; Höcherl, P. ; Martin, A. ; Niemetz, M. ; Schoepe, Wilfried


The damping of the oscillations of a small magnet (spherical shape, radius 0.1 mm) levitating between two parallel YBCO surfaces is measured as a function of oscillation amplitude and temperature. The losses in the samples (epitaxial thin films, bulk granular and bulk melt-textured) are analyzed in terms of oscillating shielding currents flowing through trapped flux lines. We find dissipation ...


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