Superconductor-Insulator Transition in a Two-Dimensional Array of Resistively Shunted Small Josephson Junctions

Yamaguchi Takahide; Ryuta Yagi; Akinobu Kanda; Youiti Ootuka; Shun-ichi Kobayashi

doi:10.1103/PhysRevLett.85.1974

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Superconductor-Insulator Transition in a Two-Dimensional Array of Resistively Shunted Small Josephson Junctions

Yamaguchi Takahide, Ryuta Yagi, Akinobu Kanda, Youiti Ootuka, Shun-ichi Kobayashi

DOI 10.1103/PhysRevLett.85.1974 · Physical Review Letters

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Abstract

We have fabricated two-dimensional (2D) small-Josephson-junction arrays of which each Al−AlOx−Al junction is shunted by a Cr resistor. The arrays with large junction resistance and large charging energy show a transition from insulating to superconducting behavior when the shunt resistance is lowered below a critical value, which is close to 2RQ ( RQ≡h/4e2=6.45kΩ). The measured phase diagram is consistent with theories of quantum-fluctuation-driven and dissipation-driven phase transitions in the 2D Josephson-junction array with Ohmic shunt resistors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure unresolved	onset