Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence
TT 25.5: Vortrag
Mittwoch, 27. Februar 2008, 15:00–15:15, H 3010
Josephson Effect in Hybrid Oxide Heterostructures with an Antiferromagnetic Layer — •Philipp Komissinskiy1,2,3, Gennady Ovsyannikov2,3, Igor Borisenko2, Yulii Kislinskii2, Sandra Heinz1, Dag Winkler3, and Lambert Alff1 — 1Department of Materials Science, Darmstadt University of Technology, 64287 Darmstadt, Germany — 2Institute of Radio Engineering and Electronics Russian Academy of Sciences, 125009 Moscow, Russia — 3Department of Microtechnology and Nanoscience, Chalmers University of Technology, 41296 Gothenburg, Sweden
Josephson coupling between an s- and d-wave superconductor through Ca1−xSrxCuO2 antiferromagnetic layer was observed for the hybrid Nb/Au/Ca1−xSrxCuO2/YBa2Cu3O7−δ heterostructures and investigated as a function of temperature, magnetic field and applied millimeter-wave electromagnetic radiation [1]. Values of the Josephson characteristic voltage Vc=IcRN∼100−200 µV were demonstrated in the Nb/Au/CSCO/YBCO junctions with up to 50 nm thick CSCO AF layer. The ac Josephson effect is manifested in multiple Shapiro steps, which are well fitted by the RSJ Josephson junction model. The magnetic field dependence of the supercurrent Ic(H) exhibits anomalously rapid oscillations, which is the first experimental evidence of the theoretically predicted giant magneto-oscillations in Josephson junctions with antiferromagnetic interlayers.
[1] P. Komissinskiy, G. A. Ovsyannikov, I. V. Borisenko, Yu.V. Kislinskii, K.Y. Constantinian, A.V. Zaitsev, and D. Winkler, Phys. Rev. Lett. 99, 017004 (2007).