Charging energy and phase delocalization in single very small Josephson tunnel junctions

M. Iansiti; A. T. Johnson; Walter F. Smith; H. Rogalla; C. J. Lobb; M. Tinkham

doi:10.1103/PhysRevLett.59.489

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Charging energy and phase delocalization in single very small Josephson tunnel junctions

M. Iansiti, A. T. Johnson, Walter F. Smith, H. Rogalla, C. J. Lobb, M. Tinkham

DOI 10.1103/PhysRevLett.59.489 · Physical Review Letters

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Abstract

We have measured current-voltage characteristics of very small [0.4–0.02 (μm)2] Sn-SnOx-Sn tunnel junctions, having estimated charging energy e2/2C comparable to their other characteristic energies. In the higher-Rn devices, after rising just below Tc, Ic decreases as the temperature is decreased further, and then increases again, at the lowest temperatures. Although the junctions are hysteretic, a significant resistance is found at currents below Ic. We suggest an interpretation involving the quantum nature of φ and the competition between the charging, Josephson, and thermal energies of the system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.75	Pressure not reported	unknown