Tuning of phase diffusion in small Josephson junctions by magnetic field
Y. Koval, M. V. Fistul, A. V. Ustinov
DOI 10.1103/PhysRevB.73.212505 · Physical Review B
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Abstract
We report experimental and theoretical study of low-voltage resistive states in submicrometer Josephson tunnel junctions placed in an external magnetic field H. The junctions display a low-voltage Josephson phase diffusion branch characterized by small but finite resistance and hysteretic switching to higher voltages. Depending on the junction area, we observe two different effects of the external magnetic field on the low-voltage part of current-voltage characteristics. In the first case, the maximum voltage Vm of the phase-diffusion branch increases with magnetic field. In the second case, we find Vm to be nearly independent of magnetic field. These resistive states depend on the ratio between the Josephson energy EJ(H) and energy of thermal fluctuations kBT. A theoretical analysis based on a diffusion of the ”center mass“ of the Josephson phase is in good accord with experimental observations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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