Superconductors.ORG herein reports the 28C room-temperature superconductordiscovered in December 2011 has been successfully reformulated to produce a critical transition temperature (Tc) above 30 Celsius (86F, 303K). This new material has a nominal formula of Tl5Pb2Ba2Mg2.5Cu8.5O17+ and a Tc near 30.5C. See Also: New Support for Phonon Mediation in High Temperature Superconductors
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.