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Spin-polarized quasiparticles injection effects in the normal state of YBCO thin films

✍ Scribed by S. Soltan; J. Albrecht; H.-U. Habermeier

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 163 KB
Volume: 460-462
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2007.03.221

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✦ Synopsis

We report detailed transport studies on ferromagnet-superconductor heterostructures. Epitaxial heterostructures of half-metal colossal magnetoresistive La 2/3 Ca 1/3 MnO 3 (HM-CMR) and high-T c superconducting YBa 2 Cu 3 O 7Àd (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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