Regensburg 2000 – scientific programme

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TT: Tiefe Temperaturen

TT 15: Grundlegende Experimente zur Supraleitung

TT 15.6: Talk

Wednesday, March 29, 2000, 17:00–17:15, H20

Experimental Study of Superconductor/Ferromagnet Proximity Effect — •Ilgiz Garifullin¹, Laura Lazar², Kurt Westerholt², Hartmut Zabel², Yura Goryunov¹, Nadir Garif’yanov¹, and Lenard Tagirov³ — ¹Kazan Physicotechnical Institute, Russian Academy of Sciences, 420029 Kazan, Russian Federation — ²Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — ³Kazan State University, 420008 Kazan, Russian Federation

We report on measurements of structural, superconducting and magnetic properties of tri- and bilayer systems combined of superconducting Pb or V and ferromagnetic Fe. We find an oscillation of the superconducting transition temperature when plotted versus the thickness of the ferromagnetic layer, which we regard as a clear indication of an unconventional, propagating superconducting pair wave function in the S/F systems. We fit our results using recent theoretical model calculations and find evidence for a strongly reduced transparency of the S/F-interface. We regard this as an essential feature of the S/F proximity effect and discuss its physical origin.