Electrical Сharacteristics of Long Josephson Junctions Based on Tungsten Nanorods as Weak Links: Effect of Random Critical-Current Distributions

Grib, Alexander; Savich, S. V.; Вовк, Р. В.; Shaternik, V.E.; Shapovalov, A. P.; Seidel, P.

doi:10.1109/tasc.2018.2865468

Cited by 4 publications

(3 citation statements)

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“…It is interesting to note that instead of the step at v p=2,s =0.49 there exists the long jump to smaller voltages. This jump appears because of the hysteretic behavior of the IV-curve in the region of the zero-field step at the backward movement of the bias current [8]. Jumps in the IV-curve as well as steps show the presence of resonance particularities.…”

Section: Resultsmentioning

confidence: 99%

“…The system of equations (1)-(4) is different from that which we used in our previous calculations [4,5,8]. Due to inequality of coefficients .…”

Section: The Modelmentioning

confidence: 94%

“…For calculations we used the scheme of two inductively interacting long Josephson junctions which was described elsewhere [4,5,8], so here we give only its brief description. According to this scheme, each of long junctions with indices i=1, 2 is divided to n segments.…”

Section: The Modelmentioning

confidence: 99%

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Coherent emission from the stack of Josephson junctions with the non-uniform inductive interaction

2019

The Journal of v. N. Karazin Kharkiv National University, Series "Physics"

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During last decade, considerable efforts were made to achieve coherent emission from stacks of many Josephson junctions. It is known that strong emission from a junction in the presence of external magnetic field appears at the so-called Fiske steps in the IV-characteristic at voltages which correspond to frequencies of geometrical resonances. However, it is possible to obtain resonant steps in long junctions without external magnetic field. The periodical movement of fluxons is excited due to some disorder in the distribution of critical currents along junctions. The so-called zero-field steps are formed in the IV-curve due to the interaction of fluxons with oscillations of voltage at Josephson frequencies. We investigated numerically IV-characteristics and the dependence of the average square of ac voltage at the end of the stack of two long Josephson junctions on the average voltage. Junctions interacted inductively with each other. We introduced not only the Gaussian distribution of critical currents along junctions but also the Gaussian distribution of coefficients of the interaction between junctions (mutual inductances). Zero-field steps in the IV-characteristic were found at voltages which corresponded to frequencies of in-phase collective modes in the stack as well as to frequencies of uncoupled junctions. Zero-field steps appeared in the hysteretic region of the IV-curve. There appeared also jumps of voltage from the resistive branch to the zero-field step. We showed that there existed distributions of mutual inductances along junctions which provided jumps to voltages at which the average square of ac voltage at the end of the stack (which is proportional to power of emission) was larger than that for the stack with the uniform distribution of mutual inductances.

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Section: Resultsmentioning

confidence: 99%

“…The system of equations (1)-(4) is different from that which we used in our previous calculations [4,5,8]. Due to inequality of coefficients .…”

Section: The Modelmentioning

confidence: 94%