Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.38: Poster
Monday, March 7, 2005, 14:00–18:00, Poster TU D
Superconducting/ferromagnetic proximity effect mediated by Cr-spacer layers in the Fe/Cr/V/Cr/Fe thin film system — •M. Fattakhov1, I. Garifullin2, L. R. Tagirov3, K. Westerholt1, and H. Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik Ruhr-Uni 44780 Bochum — 2Zavoisky Physical-Technical Institute, 420029 Kazan, Russia — 3Kazan State University, 420008 Kazan, Russia
We have studied the superconducting proximity effect in the thin film system Fe/Cr/V/Cr/Fe where the Cr layers play the role of screening layers between the superconducting V-layer and the strongly pair breaking Fe-layers. When keeping the thickness of the Fe-layers dFe fixed and varying the thickness of the Cr-layers dCr, the superconducting transition temperature Tc first rises reaching a maximum at dCr=40 Å and then sharply drops for larger Cr-thickness. Keeping dCr constant and varying dFe the superconducting transition temperature becomes independent on dFe for dCr>40 Å. The results demonstrate that the Cooper pairs penetrate into the Cr-layer to a depth of about 40 Å. From our experimental results we suggest that the Cr-layer is nonmagnetic for dCr<40 Å and undergoes a transition to an incommensurate spin density wave state for dCr>40 Å.