The Meissner Influence demonstrated by levitating a magnet over a cuprate superconductor, that is cooled by liquid nitrogen Under some conditions, which include exceptionally very low temperatures, some ceramics exhibit high-temperature superconductivity (in superconductivity, "high temperature" means higher than 30 K). The main reason for this is not comprehended, but https://magneticbead03603.iyublog.com/38061699/advanced-ceramics-an-overview