High temperature superconducting with two doping atoms in La-doped Bi-2201 and Y-doped Bi-2212

These crystals have two doping patterns given by oxygen excess and doping with an additional atom with projected positions in the CuO2 plane. Both doping elements are necessary for the occurrence of superconductivity. Where the two doping patterns overlap, the point matched locations act as the resonating superconducting pathway and might explain a correlation between Tc and the doping structure.