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Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 9.6: Talk

Monday, March 26, 2007, 17:45–18:00, H20

Ferromagnetic-superconducting heterostructures: Direct evidence for spin polarized quasiparticle self injection — •Soltan Soltan1,2, Joachim Albrecht3, Maerit Djupmyr3, and Hanns-Ulrich Habermeier11Max–Planck–Institut für Festkörperforschung, Heisenbergstr. 1, D–70569 Stuttgart, Germany — 2Physics Department, Faculty of Science, Helwan University, 11792-Helwan, Cairo, Egypt — 3Max–Planck–Institut für Metalforschung, Heisenbergstr. 1, D–70569 Stuttgart, Germany

Epitaxial heterostructures of half–metal colossal magnetoresistive LCMO (HM–CMR) and high-Tc superconducting YBCO(HTSC) are grown on SrTiO3(100) single crystal substrates by pulsed laser deposition. New transport R(T), magnetization M(T), and Hall effect measurements has been done. The R(T) shows an upturn at T = 30K to normal state resistance below the superconducting transition temperature Tc = 50K. This upturn in the resistance is matching with magnetization saturation Ms(T) for the same heterostructure. We explain our new results as a direct evidence for spin–polarized quasiparticle self injection.

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