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Quantum and phase diffusion crossovers in small Al Josephson junctions

Author

Listed:
  • Pankratov, Andrey L.
  • Ladeynov, Dmitry A.
  • Revin, Leonid S.
  • Gordeeva, Anna V.
  • Il’ichev, Evgeny V.

Abstract

Switching current distributions (SCDs), describing switching statistics from a superconducting to a resistive state, are measured for a set of aluminum-made Josephson junctions (JJ) in a temperature range from 15mK to 1K. The measured data are compared with existing theories and computer simulation in the frame of the second order pendulum model, with account of noise and temporal driving. Generalizing the obtained data, it is shown that the crossover temperature between the running state and the phase diffusion regime scales exponentially versus kBT/ħω for JJ critical currents from 70 to 1000nA. Besides, the quantum crossover temperature decreases with decreasing critical current. Also, the quantum floor (the SCD width) below the quantum crossover temperature is not constant, but has a finite tilt, proportional to temperature as ħω+kBT, due to residual thermal activation switches.

Suggested Citation

  • Pankratov, Andrey L. & Ladeynov, Dmitry A. & Revin, Leonid S. & Gordeeva, Anna V. & Il’ichev, Evgeny V., 2024. "Quantum and phase diffusion crossovers in small Al Josephson junctions," Chaos, Solitons & Fractals, Elsevier, vol. 184(C).
    • Handle: RePEc:eee:chsofr:v:184:y:2024:i:c:s0960077924005423
    DOI: 10.1016/j.chaos.2024.114990
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