Abstract
We report detailed transport studies on ferromagnet-superconductor heterostructures. Epitaxial heterostructures of half-metal colossal magnetoresistive La 2/3Ca 1/3MnO 3 (HM-CMR) and high T c superconducting YBa 2Cu 3O 7 (YBCO) are grown on SrTiO 3 (100) single crystal substrates by pulsed laser deposition. Using the HM–CMR layer as source for spin-polarized quasiparticles, we show the effect of injection of spin-polarized quasiparticles into the ab-plane and along the c-axis of YBCO. The results show a drop in the ab-plane resistance R ab ( T) in the case of injection along the c-axis that is discussed to be related to the opening of a pseudogap.
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