Superconducting and transport properties of YBa 2Cu 3O 7La 0.7Sr 0.3MnO 3 bilayers

J. G. Lin, S. L. Cheng, C. R. Chang, D. Y. Xing

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Temperature-dependent resistivity, thermoelectric power, and magnetoresistance (MR) are investigated in Y Ba2 Cu3 O7 La0.7 Sr0.3 Mn O3 (YBCO/LSMO) bilayers with the thickness of YBCO fixed at 150 nm and that of LSMO varying from t=0 to 50 nm. It is found that the onset temperature Tc of the superconducting transition retains at a constant value of 74 K for t<50 nm, but reduces to 20 K at t=50 nm. In conjunction with the existence of a critical thickness of 50 nm for delocalizing charge carriers in the LSMO layer, we attribute the Tc suppression to the diffusion of spin-polarized carriers from the metallic LSMO to the YBCO layer. Furthermore, we observe a sign reversal of MR with temperature in the YBCO(150 nm)/LSMO(50 nm) bilayer, indicating a competition between a positive MR of YBCO and a negative MR of LSMO.

Original languageEnglish
Article number023910
JournalJournal of Applied Physics
Issue number2
StatePublished - 15 Jul 2005


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