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− δ (HTSC) are grown on SrTiO 3 (1 0 0) single crystal substrates using 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 in the normal state 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 spin-gap in the superconductor.
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