Field-induced superconductor-to-insulator transitions in Josephson-junction arrays

H. S. J. van der Zant; F. C. Fritschy; W. J. Elion; L. J. Geerligs; J. E. Mooij

doi:10.1103/PhysRevLett.69.2971

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Field-induced superconductor-to-insulator transitions in Josephson-junction arrays

H. S. J. van der Zant, F. C. Fritschy, W. J. Elion, L. J. Geerligs, J. E. Mooij

DOI 10.1103/PhysRevLett.69.2971 · Physical Review Letters

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Abstract

We have studied phase transitions in fabricated 2D arrays of Josephson junctions where the charging and Josephson coupling energies are about equal. We find a crossover from superconducting behavior in low fields to insulating behavior for fields above a critical value of 0.1–0.2 flux quanta per unit cell. The quantitative aspects agree well with predictions from a recent theory for quantum vortex motion by M. P. A. Fisher and with measurements on films. Similar transitions are found around values f=n/m, where f is the flux per cell and n,m=1,2,3. The field dependence is periodic in f with period 1.

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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.	1.35	Pressure not reported	unknown
InO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown