Trade American Superconductor Corporation
Superconductivity is a set of physical properties observed in some materials where electrical resistance disappears and magnetic flow fields are expelled from the material. Any material that shows these properties is the superconductor. Unlike a normal metal conductor, its resistance gradually decreases as its temperature drops even to near absolute zero, the superconductor has a characteristic critical temperature that suddenly drops below resistance to zero. The power supply can continue through a ring of ultra-conductive wires indefinitely with no power source. The superconductivity phenomenon was discovered in 1911 by Dutch physicist Heike Kamerling Owens. Like ferromagnetism and atomic spectral lines, superconductivity is a phenomenon that can only be explained by quantum mechanics. It features the Meissner effect, and the complete expulsion of magnetic field lines from the interior of the superconductor during transitions to a superconducting state. The meisner effect suggests that superconductivity cannot simply be understood as ideal conductivity in classical physics.