LEVITATION DRIFT OF A MAGNET SUPPORTED BY A HIGH-T-C SUPERCONDUCTOR UNDER VIBRATION

Since the discovery of high-T-c superconductors, many kinds of applica tions have been proposed. Among them, the high-T-c superconducting bea ring is considered to be one of the most possible applications. The be aring depends on the supporting force between a permanent magnet and a superconductor, caused by the flux pinning of high-T-c superconductor s. In this paper, the stability of levitation is discussed experimenta lly under external vibration. Then it shows the levitation drift for s intered YBaCuO, melt-quenched YBaCuO and melt-powder-melt-growth BiSrC aCuO. The characteristics of drift are explained as a relation with th e force-displacement hysteresis. A dynamical model of the magnet and h igh-T-c superconductor is also proposed to give the drift a physical m eaning numerically.