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 lambda(p) = 4.65a. The high T(c) superconductivity is stabilized at high temperature by tuning the Fermi energy of the 2D electron gas to the quantum resonance k(Fy) = 2pi/L. The confinement of a 3D electron gas in quantum wires can be realized by synthetizing Bi-CaSr-Cu-0 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 k(Fy) = 2pi/L and k(Fz) = mpi/H conditions.