Possible mechanism of superconductivity in the CuO-Cu interface

Abstract

Apparently, a two-dimensional CuO lattice is formed on the surface of copper oxide in the CuO-Cu interface. This lattice consists of Cu2+ and O1− ions, which form a narrow, partially filled two-dimensional band. In this case, local electron pairs (LEPs) can form in the oxygen subsystem as a result of the fulfillment of the Shubin-Vonsovskii conditions. A crude estimate of the formation temperature of LEPs gives T* ∼ 10 4 K. At the concentration in the interface layer n∼1.6×1020 cm−3 and the effective mass of carriers m* ∼ m e, the onset temperature of Bose-Einstein condensation may take a value of T c ∼ 1000 K. The estimate obtained for the temperature T c corresponds to the experimental value by an order of magnitude.