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TT: Tiefe Temperaturen

TT 26: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 26.1: Talk

Tuesday, March 8, 2005, 10:15–10:30, TU H3027

Heterstructures of YBCO and spin-polarized manganites - Playing around with superconducting properties — •Joachim Albrecht^1,2, 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 La_2/3Ca_1/3MnO₃ (LCMO) and optimally doped YBa₂Cu₃O_7−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