Critical currents, proximity effect, and Josephson penetration depth in planar high-T/sub c/ Josephson junctions

1997 ◽  
Vol 7 (2) ◽  
pp. 3208-3212 ◽  
Author(s):  
S.K. Tolpygo ◽  
M. Gurvitch
Keyword(s):  
Penetration Depth ◽  
Proximity Effect ◽  
Josephson Junctions ◽  
Critical Currents

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.

Magnetisation and Critical Currents in High Tc Powders

1987 ◽  
Vol 99 ◽  
Author(s):  
A. M. Campbell ◽  
A. D. Hibbs ◽  
J. Eberharde ◽  
S. Male ◽  
M. F. Ashby ◽  
...  
Keyword(s):  
Penetration Depth ◽  
Current Density ◽  
Current Flow ◽  
Theoretical Calculations ◽  
Hot Isostatic Pressing ◽  
Critical Currents ◽  
High Tc ◽  
Isostatic Pressing

ABSTRACTMagnetisation curves have been measured on powders of various sizes. The hysteresis decreases with size for articles smaller than 20μ showing that barriers to current flow are at least this far apart. The current density is 6×106 amps/cm2 at 1.5T and this is consistent with theoretical calculations of Jc. Inductive transitions are consistent with a penetration depth of about 0.5μ at 78K. The results of Hot Isostatic Pressing are also discussed.

scholarly journals Anomalous proximity effect of planar topological Josephson junctions

2020 ◽  
Vol 102 (14) ◽  
Author(s):  
S. Ikegaya ◽  
S. Tamura ◽  
D. Manske ◽  
Y. Tanaka
Keyword(s):  
Proximity Effect ◽  
Josephson Junctions

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
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