Abstract:
Apparently, a two-dimensional CuO lattice is formed on the surface of copper oxide in the CuO-Cu interface. This lattice consists of Cu$^{2+}$ and O$^{1-}$ 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 $T^*\sim10^4\,$K. At the concentration in the interface layer $n\sim1.6\times10^{20}\,$cm$^{-3}$ and the effective mass of carriers $m^*\sim m_e$, the onset temperature of Bose-Einstein condensation may take a value of $T_c\sim 1000\,$K. The estimate obtained for the temperature $T_c$ corresponds to the experimental value by an order of magnitude.
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