What you Need Superconductors are very bizarre materials at room
temperature they behave like a normal metal or ceramic,
electrically or in any other way, when they are cooled below
their critical temperature(Tc) their resistance entirely
disappears to zero. Possibly the most beautiful and accessable
result of this is magnetic levitation. What is going on? If you
more a conductor towards a magnet you change the amount of
magnetic flux in the conductor so you induce a circulating
current in a conductor. This current produces a magnetic field
which acts against the movement, just like in the magnet
dropping down a pipe experiment. If the conductor has no
resistance (its a superconductor) the current will never die
away, so the superconductor will repel the magnet and levitate.
If the superconductor was perfect it would always be repelled by
a magnet, however high temperature superconductors, which work
at 77K (-196°C) or higher will allow magnetic flux into them if
they are cooled in the flux or if you apply a