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    Title: Electrically driven spin polarization in Pr0.7Ca0.3MnO3/YBa2Cu3O7 heterostructures
    Authors: Lin, J. G.;Hsu, Daniel;Chiang, C. H;Chan, W. C.
    Contributors: 淡江大學物理學系
    Keywords: barium compounds;calcium compounds;electrical resistivity;ferromagnetic materials;high-temperature superconductors;interface magnetism;melting;praseodymium compounds;pulsed laser deposition;spin polarised transport;superconducting transition temperature;yttrium compounds
    Date: 2009-04
    Issue Date: 2010-08-09 15:48:41 (UTC+8)
    Publisher: College Park: American Institute of Physics (AIP)
    Abstract: The current and temperature dependent electrical transport is investigated in Pr0.7Ca0.3MnO3/YBa2Cu3O7 (PCMO/YBCO) heterostructures which are fabricated by pulsed laser deposition. Two PCMO/YBCO heterostructures are made with the thicknesses of PCMO varied. It is shown that the superconducting transition temperature significantly decreases with increasing thickness of PCMO and with increasing applied current, which are related to the pair breaking via the polarized electrons. However, the current-dependent normal-state resistivity shows two crossing points, indicating the competition of various phases. According to our analysis, the melting of charge ordering state by the electrical current may be the major cause for the electrically driven enhancement of spin polarization in PCMO/YBCO.
    The current and temperature dependent electrical transport is investigated in Pr0.7Ca0.3MnO3/YBa2Cu3O7 (PCMO/YBCO) heterostructures which are fabricated by pulsed laser deposition. Two PCMO/YBCO heterostructures are made with the thicknesses of PCMO varied. It is shown that the superconducting transition temperature significantly decreases with increasing thickness of PCMO and with increasing applied current, which are related to the pair breaking via the polarized electrons. However, the current-dependent normal-state resistivity shows two crossing points, indicating the competition of various phases. According to our analysis, the melting of charge ordering state by the electrical current may be the major cause for the electrically driven enhancement of spin polarization in PCMO/YBCO.
    Relation: Journal of Applied Physics 105(7), pp.07E301(3 pages)
    DOI: 10.1063/1.3055269
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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