Crossover from Josephson Tunneling to the Coulomb Blockade in Small Tunnel Junctions

M. Iansiti; A. T. Johnson; C. J. Lobb; M. Tinkham

doi:10.1103/PhysRevLett.60.2414

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Crossover from Josephson Tunneling to the Coulomb Blockade in Small Tunnel Junctions

M. Iansiti, A. T. Johnson, C. J. Lobb, M. Tinkham

DOI 10.1103/PhysRevLett.60.2414 · Physical Review Letters

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Abstract

We have fabricated small tunnel junctions with a variety of ratios of charging energy Ec to Josephson coupling energy EJ and measured their I−V characteristics. For Ec∼EJ, the I−V curve is resistive at all currents and the critical current is greatly reduced, in agreement with our theoretical estimates. As EJ is further reduced by application of a magnetic field, we find a novel regime in which aspects of the Coulomb blockade of tunneling coexist with features typical of Josephson tunneling. At still higher magnetic fields, the junction becomes normal and shows the simple Coulomb blockade.

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.	3.8	Pressure not reported	onset