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Damping of the oscillations of a permanent magnet levitating between high-Tc superconductors

Grosser, R. ; Jäger, J. ; Betz, J. ; Schoepe, Wilfried



Abstract

A permanent magnet (spherical shape, radius 100 μm) is levitating inside a superconducting parallel plate capacitor made of YBCO. Translational oscillations of the magnet at its resonance frequency (∼150 Hz) can be excited and detected. The damping of the oscillations is investigated as a function of temperature and oscillation amplitude. Close to T c we observe a steep minimum of the damping. ...

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