Magnetic suspension of superconductors at 4.2 K

Adler, Ronald J.; Anderson, W. W.
December 1988
Applied Physics Letters;12/5/1988, Vol. 53 Issue 23, p2346
Academic Journal
We have observed the stable suspension of superconductors at 4.2 K below a permanent magnet; the superconductors were the type II material Nb3Sn and the high transition temperature material YBa2Cu3Ox. Suspension below a magnet is to be distinguished from levitation above a magnet, which is the classic demonstration of the Meissner effect. Suspension at 4.2 K can be quantitatively explained as due to complete flux trapping in the superconductor. Suspension has previously been observed only at high temperatures in high transition temperature materials, in which the flux trapping is not complete.


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