scholarly journals Influence of trapped flux on critical currents of Josephson junctions

2008 ◽  
Vol 5 (11) ◽  
pp. 431-436 ◽  
Author(s):  
Bjoern Ebert ◽  
Torsten Reich ◽  
Thomas Ortlepp ◽  
Pascal Febvre ◽  
F. Hermann Uhlmann
Keyword(s):  
Josephson Junctions ◽  
Critical Currents ◽  
Trapped Flux

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

2019 ◽  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Gaussian Distribution ◽  
Josephson Junctions ◽  
Critical Currents ◽  
Collective Modes ◽  
Zero Field ◽  
Strong Emission ◽  
Inductive Interaction ◽  
Coherent Emission

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.

Large critical currents and current steps in shunted bicrystal Josephson junctions at liquid nitrogen temperatures

1998 ◽  
Vol 11 (7) ◽  
pp. 609-613 ◽  
Author(s):  
A M Klushin ◽  
C Weber ◽  
M Darula ◽  
R Semerad ◽  
W Prusseit ◽  
...  
Keyword(s):  
Liquid Nitrogen ◽  
Josephson Junctions ◽  
Critical Currents ◽  
Current Steps

Fiske steps in annular Josephson junctions with trapped flux quanta

1998 ◽  
Vol 58 (17) ◽  
pp. 11685-11691 ◽  
Author(s):  
C. Nappi ◽  
R. Cristiano ◽  
M. P. Lisitskii
Keyword(s):  
Josephson Junctions ◽  
Trapped Flux

Pinning phenomena and critical currents in disordered long Josephson junctions

1992 ◽  
Vol 45 (10) ◽  
pp. 5450-5467 ◽  
Author(s):  
Roland Fehrenbacher ◽  
Vadim B. Geshkenbein ◽  
Gianni Blatter
Keyword(s):  
Josephson Junctions ◽  
Critical Currents

scholarly journals Critical currents in conventional Josephson junctions with grain boundaries

2021 ◽  
Vol 130 (14) ◽  
pp. 143901
Author(s):  
Miguel Antonio Sulangi ◽  
Laetitia Bettmann ◽  
T. A. Weingartner ◽  
N. Pokhrel ◽  
E. Patrick ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Josephson Junctions ◽  
Critical Currents

Dynamical Properties of Weakly Coupled Josephson Systems

1990 ◽  
Vol 195 ◽  
Author(s):  
K. H. Lee ◽  
T.-K. Xia ◽  
D. Stroud
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
Harmonic Generation ◽  
Finite Temperature ◽  
Josephson Junctions ◽  
High Temperature Superconductors ◽  
Dynamical Behavior ◽  
Critical Currents ◽  
Weakly Coupled ◽  
Dynamical Properties

ABSTRACTWe review recent work on the dynamical behavior of coupled resistively-shunted Josephson junctions, with emphasis on our own calculations. We present a model which allows for the inclusion of finite temperature, disorder, d.c. and a. c. applied currents, and applied magnetic fields. We discuss applications to (a) calculations of critical currents and IV characteristics; (b) harmonic generation and microwave absorption by finite clusters of Josephson junctions; (c) critical energies for vortex depinning; and (d) quantized voltage plateaus in arrays subjected to combined d.c. and a. c. currents. Possible connections to the behavior of granular high-temperature superconductors are briefly discussed.

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