The Meissner Effect shown by levitating a magnet earlier mentioned a cuprate superconductor, and that is cooled by liquid nitrogen Underneath some problems, for example incredibly minimal temperatures, some ceramics show high-temperature superconductivity (in superconductivity, "high temperature" usually means earlier mentioned 30 K). The reason for it's not comprehended, but https://magbeads49270.wikicorrespondent.com/6889592/little_known_facts_about_al2o3_keramik
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