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Four major families of copperoxide based high Tc superconductors have been identified by the following research groups: Bednorz and Muller (1986), Cava et al. (1988), Hor et al. (1987), Maeda et al. (1988), Sheng and Herman (1988) and Wu et al. (1987). It is now well established that the superconductivity is associated with the layers of copperoxide and that some of the remaining structural building blocks in each primitive cell act as electron acceptors which induce the holes in the copperoxide layers necessary for superconductivity.

Structure of Four Families of Layered Copper-oxide High Tc Superconductors