Anticorrelation between temperature and fluctuations of the switching current in moderately damped Josephson junctions

V. M. Krasnov; T. Golod; T. Bauch; P. Delsing

doi:10.1103/PhysRevB.76.224517

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Anticorrelation between temperature and fluctuations of the switching current in moderately damped Josephson junctions

V. M. Krasnov, T. Golod, T. Bauch, P. Delsing

DOI 10.1103/PhysRevB.76.224517 · Physical Review B

T1

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Abstract

We study the influence of dissipation on the switching current statistics of moderately damped Josephson junctions. Different types of both low- and high-Tc junctions with controlled damping are studied. The damping parameter of the junctions is tuned in a wide range by changing temperature, magnetic field, and gate voltage and introducing a ferromagnetic layer or in situ capacitive shunting. A paradoxical collapse of switching current fluctuations with increasing T occurs in all studied junctions. The phenomenon critically depends on dissipation in the junction and is explained by the interplay of two counteracting consequences of thermal fluctuations, which, on one hand, assist in premature switching into the resistive state and, on the other hand, help in retrapping back to the superconducting state. This is one of the rare examples of anticorrelation between temperature and the amplitude of fluctuations of a physically measurable quantity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75	Pressure not reported	unknown