The orbital model of 2D electron lattice in superconductivity

Abstract The mechanism of the high-T c superconductivity in the layered perovskite oxides is discussed on the basis of the 2D electron lattice model which was used to explain the long incommensurate periodicity in ferroelectrics and CDW. The 2D electron system upon the layer is considered to become covalent in the superconductive state accompanied by the transformation from the square 2D electron lattice to the hexagonal 2D electron lattice. Such transformation will be realized if electron distance D of the square lattice becomes the critical value D c as the surface density σ of the electron system is changed by the condition D 2 σ = e, where a kind of the molecular orbitals in Laguerre type are created and many electron pairs, and holes coexist upon the plane.