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How does cooling a magnet allow it to quantum lock/levitate? I have seen it in videos but do not know how it works.

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    $\begingroup$ This is also called flux pinning. $\endgroup$ – ACuriousMind Apr 10 '15 at 22:22
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    $\begingroup$ Meissner effect $\endgroup$ – user6760 Apr 11 '15 at 3:54
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    $\begingroup$ A superconductor upon reaching critical temperature usually (very low) will become a perfect diamagnet meaning they exclude all magnetic flux from the superconductor. Hence when you place a permanent magnet onto it surface, the magnetic field lines cannot penetrate the surface and have to lift it up so the lines can reach the other pole. $\endgroup$ – user6760 Apr 11 '15 at 6:01
  • $\begingroup$ Possible duplicates: physics.stackexchange.com/q/15855/2451 , physics.stackexchange.com/q/48421/2451 and links therein. $\endgroup$ – Qmechanic Apr 11 '15 at 13:13
  • $\begingroup$ Note: Not all of the flux lines are blocked from entering the superconductor. There are very few small flux lines called fluxons that flow through the superconductor. $\endgroup$ – Scientist Smith YT Jan 2 '19 at 0:11