Magnetic Properties of Superconductors When a magnetic field is applied to a superconductor at the temperature must be lowered to maintain superconductive state. Every has an associated critical magnetic field .
Messnier Effect Observed: Exclusion of a B field occurs, not a consequence of infinite conductivity Conclusive proof that superconductivity is a completely new phenomenon. Superconductors display perfect diamagnetism. Current flows only on surface.
Cu, Ag and Au, although excellent conductors do not rank among the superconducting elements. Why? Answer: Only one electron in outer shell. In Superconductive States electrons are bound together in Cooper Pairs This due to the electron-phonon interaction. Cooper Pairs
BCS Theory The BCS theory predicts a bandgap of
Maglev (magnetic levitation) is an application of superconductivity. Low friction. High Speeds Energy efficient. Maglev
Summary History Magnetic Properties of Superconductors Meissner Effect London Equations Cooper Pairs (BCS Theory) MagLev