So I am writing a paper on superconductors, and i am trying to explain the meissner effect. However i seem to be running in to conflicting information. I hoping some one can help clarify. The effect happens, when a magnet creates a change in flux, causing a induced current in the superconductor. This current produces a induced magnetic field that is opposite from the original. this repulsiveness let the magnet float or "levitate" But if the magnet is just resting at right before critical temperature, how is there a change in flux. Others state, the in type II superconductor, they reach a state in between two critical fields, which trap some magnet flux lines with in. This quantum locking, locks the magnet in place.