Nonlocal electrodynamics of long ultranarrow Josephson junctions: Experiment and theory

A. A. Abdumalikov, Jr.; V. V. Kurin; C. Helm; A. De Col; Y. Koval; A. V. Ustinov

doi:10.1103/PhysRevB.74.134515

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Nonlocal electrodynamics of long ultranarrow Josephson junctions: Experiment and theory

A. A. Abdumalikov, Jr., V. V. Kurin, C. Helm, A. De Col, Y. Koval, A. V. Ustinov

DOI 10.1103/PhysRevB.74.134515 · Physical Review B

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Abstract

We experimentally and theoretically investigate electromagnetic cavity modes in ultranarrow Al−AlOx−Al and Nb−AlOx−Nb long Josephson junctions. Experiments show that the voltage spacing between the Fiske steps on the current-voltage characteristics of sub-μm-wide and several hundred μm-long Al−AlOx−Al and Nb−AlOx−Nb Josephson junctions increases when decreasing the junction width. This effect is explained by stray magnetic fields, which become important for narrow junctions. Theoretical estimates of the Fiske step voltage based on a nonlocal wave propagation equation are in agreement with our experimental data. Using the nonlocal model, we determine the size and mass of a Josephson vortex by means of a variational approach, and relate the vortex size to the experimentally measured critical magnetic field of the junction.

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