Title 



Predicted fielddependent increase of critical currents in asymmetric superconducting nanocircuits
 
Author 



 
Abstract 



The critical current of a thin superconducting strip of width W much larger than the GinzburgLandau coherence length xi but much smaller than the Pearl length Lambda = 2 lambda(2)/d is maximized when the strip is straight with defectfree edges. When a perpendicular magnetic field is applied to a long straight strip, the critical current initially decreases linearly with H but then decreases more slowly with H when vortices or antivortices are forced into the strip. However, in a superconducting strip containing sharp 90 degrees or 180 degrees turns, the zerofield critical current at H = 0 is reduced because vortices or antivortices are preferentially nucleated at the inner corners of the turns, where current crowding occurs. Using both analytic Londonmodel calculations and timedependent GinzburgLandau simulations, we predict that in such asymmetric strips the resulting critical current can be increased by applying a perpendicular magnetic field that induces a currentdensity contribution opposing the applied current density at the inner corners. This effect should apply to all turns that bend in the same direction.   
Language 



English
 
Source (journal) 



Physical review : B : condensed matter and materials physics.  Lancaster, Pa, 1998  2015  
Publication 



Lancaster, Pa : 2012
 
ISSN 



10980121 [print]
1550235X [online]
 
Volume/pages 



85:14(2012), p. 144511,1144511,16
 
Article Reference 



144511
 
ISI 



000302611100004
 
Medium 



Eonly publicatie
 
Full text (Publisher's DOI) 


  
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