Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence
TT 9.6: Vortrag
Montag, 26. März 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 Habermeier1 — 1Max–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.