Two new effects associated with flux penetration and pinning in superconducting YBa2Cu3Ox are demonstrated. One of these is focussing of magnetic field lines by the superconductor and the other is magnetic suspension. The existence of stable equilibrium in suspension is shown to be related directly to hysteresis observed in the force-separation relation for a magnet and the superconductor. We also observe that the levitation height of a magnet increases with the magnet volume, contrary to results in the literature.
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Marshall, D.B., DeWames, R.E., Morgan, P.E.D. et al. Flux penetration in high-Tc superconductors: Implications for magnetic suspension and shielding. Appl. Phys. A 48, 87–91 (1989). https://doi.org/10.1007/BF00617765
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