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" indicates higher than thirty K). The main reason for this is not recognized, but https://magneticbead37690.bloggosite.com/46748512/examine-this-report-on-aluminum-nitride-ceramic