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Field effect in perovskite-type manganite films on high-Tc superconductor

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6 Author(s)
Sakai, J. ; Japan Inst. of Sci. & Technol., Ishikawa, Japan ; Kitagawa, A. ; Tamada, T. ; Sakai, M.
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Layered-type junctions of perovskite-type manganite Pr1-x CaxMnO3-y (PCMO; x=0.3, 0.4, 0.5) and high-T c superconductor YBa2Cu3O7 (YBCO) were fabricated and their resistivity perpendicular to the plane were measured. A field effect was observed in which the resistivity decreased for 4 orders with 10 V of applied voltage at 30 K. Several oxygen-annealed junctions showed an abrupt drop of resistivity at about 2 V, independently to x, which is considered to be a sign of charge-ordering (CO). Annealing, on the other hand, suppressed the macroscopic resistivity of PCMO films. A field effect at room temperature was also observed

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )