High Tc superconductivity by quantum confinement

We report the results of a careful experimental investigation of the Cu site configurations in the CuO2 plane of Bi2Sr2CaCu2O8+y (Bi2212) showing that the quasi 2D Fermi liquid is confined in the stripes of width L with a superlattice period λp=4.65a. The high Tc superconductivity is stabilized at high temperature by tuning the Fermi energy of the 2D electron gas to the quantum resonance kFy=2π/L. The confinement of a 3D electron gas in quantum wires can be realized by synthetizing Bi-Ca-Sr-Cu-O systems with some adjacent CuO2 layers forming a metallic slab of thickness H. In this case the amplification of the critical temperature is assigned to quantization of the wavevectors along both the y and z directions satisfying the kFy=2π/L and kFz=mπ/H conditions. (orig.)