Ferroelectric Polarization Effects in the Surface Superconductivity

Abstract

Ferroelectric polarization effects of the heterostructures normal metal-ferroelectric-superconducting high-T_c 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-T_c cuprates and other compounds with high transition temperature. We have found various electric field effects in these systems.

Keywords:

• Ferroelectric materials
• superconducting materials
• electric field effects

PACS:

• 74.70.-b
• 74.78.-w
• 77

Acknowledgment

The research was supported by the Estonian Ministry of Education and Research (SF0180013s07) and by the European Union through the European Regional Development Fund (TK114, SF0180013s07AP).