Berlin 2005 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.16: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Electron-Polarization Coupling in Superconductor-Ferroelectric Superlattices — •Natalia Pavlenko^1,2 and Franz Schwabl² — ¹Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — ²Institute of Theoretical Physics, Department of Physics, Technical University og Munich, 85747 Garching, Germany

We present a phenomenological model of periodic ferroelectric-superconductor (FE-S) heterostructures containing two alternating ferroelectric and superconducting layers. The interaction at the FE-S contacts is described as a coupling of the local carrier density of the superconductor with the spontaneous ferroelectric polarization near the FE-S interface. We obtain a stable symmetric domain-type phase exhibiting a contact-induced polarization and the ferroelectric domain structure at temperatures above the bulk ferroelectric transition temperature. The system is analyzed for different thicknesses of the FE- and S-films demonstrating the dramatic change of the topology of the phase diagrams with a variation of the layers thickness. The results are expected to shed light on processes occurring in high-temperature superconducting films grown on perovskite alloy-substrates exhibiting ferroelectric properties at lower temperatures.