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://magneticbeadsrnaisolation26936.blogoscience.com/45796582/the-2-minute-rule-for-what-is-ceramic