Tuning of phase diffusion in small Josephson junctions by magnetic field

Koval Y, Fistul M, Ustinov A (2006)

Publication Language: English

Publication Type: Journal article, Letter

Publication year: 2006


Publisher: American Physical Society

Pages Range: 212505

Journal Issue: 73

URI: http://www.fluxongroup.physik.uni-erlangen.de/publications/2006/KovalFistulUstinovPRB2006.pdf

DOI: 10.1103/PhysRevB.73.212505


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 kB T. A theoretical analysis based on a diffusion of the "center mass" of the Josephson phase is in good accord with experimental observations. © 2006 The American Physical Society.

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Koval, Y., Fistul, M., & Ustinov, A. (2006). Tuning of phase diffusion in small Josephson junctions by magnetic field. Physical Review B, 73, 212505. https://dx.doi.org/10.1103/PhysRevB.73.212505


Koval, Yury, Mikhail Fistul, and Alexey Ustinov. "Tuning of phase diffusion in small Josephson junctions by magnetic field." Physical Review B 73 (2006): 212505.

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