Role of the inner copper-oxide plane in interlayer Josephson effects in multi-layered cuprate superconductors

28 Sep 2019 Nomura Y. Okamoto R. Mizuno T. Adachi S. Watanabe T. Suzuki M. Kakeya I.

We find systematic signatures suggesting a different superconducting nature for a triple-layered cuprate Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+\delta}$ with respect to a double-layer through the properties of intrinsic Josephson junctions (IJJs). Our measurements on the current-voltage characteristics reveal that the $c$-axis maximum Josephson current density is sensitive to the superfluid density in outer planes while the critical temperature and the superconducting gap remain unaffected... (read more)

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