The Meissner impact shown by levitating a magnet over a cuprate superconductor, that is cooled by liquid nitrogen Under some conditions, including very low temperatures, some ceramics show high-temperature superconductivity (in superconductivity, "high temperature" signifies previously mentioned 30 K). The key reason why for this is simply not understood, but https://claytonoqnki.blogtov.com/19823424/nitreto-de-boro-hexagonal-an-overview