Abstract
Ferroelectric polarization effects of the heterostructures normal metal-ferroelectric-superconducting high-Tc film are studied in the transverse electrostatic field. A boundary condition for the Ginzburg-Landau wave function of a one-band superconductor at surfaces biased by a strong electrostatic transverse electric field is derived within the de Gennes approach. This boundary condition is applied to the metal-ferroelectric-superconductor structures. The coherence length is critical and it supports the existence of thin superconducting films, such as high-Tc cuprates and other compounds with high transition temperature. We have found various electric field effects in these systems.
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