Dresden 2003 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Tiefe Temperaturen
TT 8: Supraleitung: Dünne Schichten, Josephsonkontakte, SQUIDs
TT 8.3: Vortrag
Dienstag, 25. März 2003, 10:15–10:30, HSZ304
Proximity effect in Superconductor/Ferromagnet Nanoscale Layered System — •A. Sidorenko1,2, A. Prepelitsa2, V. Zdravkov2, C. Helbig1, M. Schreck1, S. Klimm1, S. Horn1, L. Tagirov3, and R. Tidecks1 — 1Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany — 2Institute of Applied Physics, MD2028 Kishinev, Moldova — 3Kazan State University, 420008 Kazan, Russia
We investigated Nb/Ni bilayers prepared by magnetron sputtering. The quality of the films was characterized by small-angle X-ray diffraction analysis (SAXS) yielding a layers roughness less than 0.3nm [1]. The thickness of the layers was determined by the Rutherford backscattering spectrometry (RBS) with an accuracy of 0.02 nm. For specimens with constant Nb layer thickness we observed a non-monotonic behavior of the critical temperature upon increasing of the Ni layer thickness with distinct oscillations of Tc(dNi) at small thickness of the Ni layer. The results are interpreted in terms of Fulde-Ferrell-Larkin-Ovchinnikov -like inhomogeneous superconducting pairing [2] in the ferromagnetic Ni layer.
This work was partially supported by INTAS (Project Nr.99-00585).
References
[1] A. Sidorenko, V. Zdravkov, A. Prepelitsa, C. Helbig, Y. Luo, S. Gsell, M. Schreck, S. Klimm, S. Horn, L. Tagirov, R. Tidecks, Physica B 325 (2003), accepted for publication.
[2] P. Fulde and R. Ferrell, Phys. Rev. 135 (1964) A550; A. I. Larkin and Yu. N. Ovchinnikov, ZhETF 47 (1964) 1136 [Sov. Phys. JETP 20 (1965) 762].