It's a pretty amazing phenomenon. Maybe one day we will use it for transportation.
Quantum levitation--which can rigidly log objects in space in seeming defiance of the laws of gravity--relies on a superconductor, the Meissner effect and magnetic flex tubes. The floating disc consists of a sapphire wafer and--here's the important part--a micrometer-thin sheet of barium copper oxide. When cooled below -301 degrees Fahrenheit (-185 Celsius) the barium copper oxide layer becomes a superconductor, allowing it to conduct electricity without resistance or energy loss.
Inside each magnetic flux tube superconductivity is locally destroyed. The superconductor will try to keep the magnetic tubes pinned in weak areas (e.g. grain boundaries). Any spatial movement of the superconductor will cause the flux tubes to move. In order to prevent that the superconductor remains “trapped” in midair. - Read article