Role of the inner copper oxide plane in interlayer Josephson effects in multilayered cuprate superconductors

Yoshiki Nomura; Riku Okamoto; Taka-aki Mizuno; Shintaro Adachi; Takao Watanabe; Minoru Suzuki; Itsuhiro Kakeya

doi:10.1103/PhysRevB.100.144515

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Role of the inner copper oxide plane in interlayer Josephson effects in multilayered cuprate superconductors

Yoshiki Nomura, Riku Okamoto, Taka-aki Mizuno, Shintaro Adachi, Takao Watanabe, Minoru Suzuki, Itsuhiro Kakeya

DOI 10.1103/PhysRevB.100.144515 · Physical Review B

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Abstract

We find systematic signatures suggesting a different superconducting nature for a triple-layered cuprate Bi2Sr2Ca2Cu3O10+δ 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. Switching dynamics of stacked IJJs exhibit that the fluctuation in the gauge-invariant phase difference of an IJJ implies that the inner plane completely shields the capacitive coupling between adjacent IJJs, which is essential for mono- and bilayered cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2Ca2Cu3O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	107	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown