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Jpn. J. Appl. Phys. 29 (1990) pp. L2219-L2222  |Next Article|  |Table of Contents|
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Letter

Current-Voltage Characteristics of YBa₂Cu₃O_y/La_0.7Ca_0.3MnO_z/YBa₂Cu₃O_y Trilayered-Type Junctions

Masahiro Kasai, Toshiyuki Ohno, Yoko Kanke, Yuzoo Kozono, Masanobu Hanazono and Yutaka Sugita

Hitachi Research Laboratory, Hitachi, Ltd.

(Received August 10, 1990; revised manuscript revised September 28, 1990; accepted for publication November 5, 1990)

YBa₂Cu₃O_y(superconductor)/La_0.7Ca_0.3MnO_z(magnetic material)/YBa₂Cu₃O_y(superconductor) trilayered-type junctions were prepared on MgO(100) single-crystal substrates, and the current-voltage characteristics were examined. The top and bottom YBa₂Cu₃O_y layers were 200 nm thick, and the La_0.7Ca_0.3MnO_z layer was 20, 30, 50 or 100 nm thick. A supercurrent was observed through all the La_0.7Ca_0.3MnO_z layers, even the thickest one. Further investigation showed that a supercurrent could he observed through the 500-nm barrier layer.

URL: http://jjap.jsap.jp/link?JJAP/29/L2219/
DOI: 10.1143/JJAP.29.L2219
KEYWORDS:high T_{c$ superconductor, proximity effect, tunnel junction, $I$-$V$ characteristics, magnetic oxide, YBa$2$Cu$3$O$y$, La$0.7$Ca$0.3$MnO$z$}

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