Intrinsic Josephson effect in La2-xSrxCuO4 mesa junctions with niobium counter electrode

Y. Uematsu, K. Nakajima, T. Yamashita, I. Tanaka, H. Kojima

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Abstract

We reveal the intrinsic Josephson effect in a La2-xSrxCuO4 (LSCO) high-Tc superconductor. Nb counterelectrodes are deposited on top of mesas, which are formed on surfaces either parallel or perpendicular to the ab plane of LSCO single crystals. Nb/LSCO interfaces behave as SNS Josephson junctions. For the junctions parallel to the ab plane, we observe many branches in the current-voltage characteristics due to intrinsic Josephson effects. The voltage gaps between the branches are typically 0.1 mV, which is much smaller than the superconducting energy gap 2Δ≅11 mV expected for LSCO from Bardeen-Cooper-Schrieffer theory.

Original languageEnglish
Pages (from-to)2820-2822
Number of pages3
JournalApplied Physics Letters
Volume73
Issue number19
DOIs
Publication statusPublished - 1998 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Uematsu, Y., Nakajima, K., Yamashita, T., Tanaka, I., & Kojima, H. (1998). Intrinsic Josephson effect in La2-xSrxCuO4 mesa junctions with niobium counter electrode. Applied Physics Letters, 73(19), 2820-2822. https://doi.org/10.1063/1.122601