superconductors is divided to two types depending on it's temperature:
1- Low temperature superconductors(LTC): it is called also conventional superconductors such as Mercury and this type characterized by low critical temperature(Tc).
2- High temperature superconductors(HTS):this type characterized by high critical temperature(Tc).for example,(La2 Ba1 Cu O4)
The low temperature superconductors can be explained with BCS theory. The high temperature ones, not so much
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