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Magnetoresistance effects on La0.67Ca0.33MnO3/YBa2Cu3Oy/Ni trilayers

✍ Scribed by X.S. Wu; B. Qian; Y.M. Zhang; B. You; J.S. Liu; S.S. Jiang; J. Gao; Z.H. Wu; W.L. Zheng; Q.J. Jia; X.M. Jiang

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 429 KB
Volume: 423
Category: Article
ISSN: 0921-4534
DOI: 10.1016/j.physc.2005.04.002

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✦ Synopsis

La 0.67 Ca 0.33 MnO 3 (LCMO)/YBa 2 Cu 3 O y (YBCO)/Ni trilayers were fabricated with varying thickness of the midsuperconducting YBCO layer. Two different deposition systems were used to avoid oxidation of the magnetic metal Ni and contamination of the deposition systems. Transport properties show that the temperature dependence of resistance goes from a metallic-to-metal-insulator transition (manganite-like behavior) to a superconducting behavior (M-M-S) with increase of the thickness of the YBCO layer. The magnetoresistance (MR) ratio is very small in comparison with LCMO/YBCO bilayers at low temperature. Such phenomenon may depend on the charge transfer and the magnetic spin interaction between the bottom and cap magnetic layers.

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