1. Conventional superconductor: 96% hole superconductors (Chapnik rule). 2. HTSC: hole doped Tc much greater than electron doped Tc 3. Phase diagram of Tc and % of doping: concave, superconductor in a limited region of doping. 4. Homes scaling law: Tc ~ const*(number of superconducting electrons)*(resistivity in normal state) More @Wikipedia
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