Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 30: Superconductivity - Applications II : Levitation, SQUID-based Sensors, Devices

TT 30.5: Vortrag

Dienstag, 8. März 2005, 17:45–18:00, TU H104

Superconductivity Controlled by Interface Polarization: Novel Perspectives for Superconducting Field-Effect Devices — •Natalia Pavlenko — Institute of Physics, University of Augsburg, Universitaetstr.1, D-86135 Augsburg, Germany

Recent experiments performed on the high-Tc superconducting films clearly demonstrate that an external electric field applied accross a dielectric/ferroelectric gate can effectively control a reversible superconductor-insulator switching behavior which plays a key role in the superconducting oxide electronics. On the basis of our recently developed microscopic approach [1,2], we show that the electric polarization at the interface with ultrathin superconducting films sandwiched between ferroelectric layers allows the achievement of a substantially stronger modulation of the inner carrier density and superconducting transition temperature as compared to ferroelectric-superconducting bilayers typically used in superconducting field-effect devices. We propose a novel design concept for superconducting electric field-effect transistors and provide theoretical calculations that indicate how the field effect in these devices could be amplified.

[1] N. Pavlenko and F. Schwabl, Phys.Rev.B 67, 094516 (2003). [2] N.Pavlenko, Phys.Rev.B 70, 094519 (2004); N.Pavlenko et al., cond-mat/0407696.