Magnetic flux quanta in annular Josephson junctions in a barrier-parallel de magnetic field

S. Keil; I. V. Vernik; T. Doderer; A. Laub; H. Preβler; R. P. Huebener; N. Thyssen; A. V. Ustinov; H. Kohlstedt

doi:10.1103/PhysRevB.54.14948

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Magnetic flux quanta in annular Josephson junctions in a barrier-parallel de magnetic field

S. Keil, I. V. Vernik, T. Doderer, A. Laub, H. Preβler, R. P. Huebener, N. Thyssen, A. V. Ustinov, H. Kohlstedt

DOI 10.1103/PhysRevB.54.14948 · Physical Review B

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Abstract

Flux quanta (fluxons) trapped in an annular Josephson junction reside in a spatially periodic pinning potential when a uniform external magnetic field is applied parallel to the plane of the junction's tunnel barrier. We investigate the fluxon behavior by measuring the current versus voltage curves, the magnetic dependence of the junction critical current, and by means of spatially resolved measurements imaging the pinned fluxons. We derive the fluxon potential energy including fluxon-fluxon interaction. Fair agreement of this calculation with our experimental results is obtained.

Source-reported materials — not catalogue approval

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