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- W2025560087 abstract "Abstract We have measured the zero bias resistance, R 0 , and the threshold voltage, V t , of 2D arrays of small Josephson junctions as functions of temperature and magnetic field. At low temperature, the Coulomb blockade dominates due to the relatively large charging energy E C =e 2 /2C (C being the junction capacitance). We find that the zero bias resistance may be described by thermal activation of charge solitons in most cases, i.e., R 0 ≈k exp(E a /k B T). In the normal state, the activation energy E a is close to 0.25 E C . The measured activation energy at low magnetic field is less than 0.25E C +Δ (where Δ is the superconducting gap), but larger than E C for all arrays. In a few samples, where the Josephson coupling energy E J is relatively large, E a oscillates with the magnetic field. The period of the oscillation corresponds to one flux quantum per unit cell and the amplitude is roughly E J . In these samples the threshold voltage also oscillates at low magnetic fields. Such behavior of both E a and V t is a clear indication that also Cooper pair solitons contribute to the charge transport." @default.
- W2025560087 created "2016-06-24" @default.
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- W2025560087 date "1994-02-01" @default.
- W2025560087 modified "2023-09-30" @default.
- W2025560087 title "Thermal activation and injection of charge solitons in 2D-arrays of small Josephson junctions." @default.
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- W2025560087 doi "https://doi.org/10.1016/0921-4526(94)90826-5" @default.
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