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Detecting flux creep in superconducting YBCO thin films via damping of the oscillations of a levitating permanent magnet

Grosser, R. ; Martin, A. ; Niemetz, M. ; Pechen, E. V. ; Schoepe, Wilfried

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The damping of the oscillations of a small permanent magnet (spherical shape, radius 0.1 mm) levitating between two parallel epitaxial YBCO films is measured as a function of oscillation amplitude and temperature. At small amplitudes the dissipation is found to be orders of magnitude lower than in bulk YBCO, Q-factors exceeding one million at low temperatures. With increasing amplitude the ...


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