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TT: Tiefe Temperaturen
TT 26: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence
TT 26.1: Vortrag
Dienstag, 8. März 2005, 10:15–10:30, TU H3027
Heterstructures of YBCO and spin-polarized manganites - Playing around with superconducting properties — •Joachim Albrecht1,2, Soltan Soltan2 und Hanns-Ulrich Habermeier2 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart
We have grown epitaxial bilayers of La2/3Ca1/3MnO3 (LCMO) and optimally doped YBa2Cu3O7−δ (YBCO) on single-crystalline substrates. Owing to the vicinity of the ferromagnetic, highly spin-polarized LCMO layer the properties of the YBCO film can change substantially. We investigated in detail the transition temperature [1], the critical current density [2] and the resistivity in the normal conducting state [3] of YBCO films in bilayers and heterostructures with different geometry. It is shown in this contribution that both the magnetic stray field and the spin polarization of the manganite strongly influences the properties of the YBCO thin film.
[1] S. Soltan, J. Albrecht and H.–U. Habermeier, Phys. Rev. B 70, 144517 (2004).
[2] J. Albrecht, S. Soltan and H.–U. Habermeier, Physica C 408-410, 482 (2004).
[3] S. Soltan, J. Albrecht and H.–U. Habermeier, Solid State Comm., submitted