That's an interesting idea. I wonder if that couldn't be used to bootstrap a room-temperature superconductor: cool it down, start a magnetic field, and let the magnetic field reaction compress the material so that you can let it heat back to room temperature. Could an external or room-temperature field also possibly be enough?
Yeah you'd still need a bootstrap to get the reaction going, and therefore generate the pressure. The question is, does this material have two superconduction modes: one at low temperatures and pressures, and another at high temperatures and pressure?
The idea would be to create a superconductor with a pressure/temp curve that is amenable to the pressure/temp curve of the starting sequence of a fusion reactor.
