Title 



Collective vortex phases in periodic plus random pinning potential
 
Author 



 
Abstract 



We study theoretically the simultaneous effect of regular and random pinning potentials on the vortex lattice structure at filling factor of 1. This structure is determined by a competition between the square symmetry of regular pinning array, by the intervortex interaction favoring a triangular symmetry, and by the randomness trying to depin vortices from their regular positions. Both analytical and moleculardynamics approaches are used. We construct a phase diagram of the system in the plane of regular and random pinning strengths and determine typical vortex lattice defects appearing in the system due to the disorder. We find that the total disordering of the vortex lattice can occur either in one step or in two steps. For instance, in the limit of weak pinning, a square lattice of pinned vortices is destroyed in two steps. First, elastic chains of depinned vortices appear in the film; but the vortex lattice as a whole remains still pinned by the underlying square array of regular pinning sites. These chains are composed into fractallike structures. In a second step, domains of totally depinned vortices are generated and the vortex lattice depins from regular array.   
Language 



English
 
Source (journal) 



Physical review : B : solid state.  Lancaster, Pa, 1970  1978  
Publication 



Lancaster, Pa : 2009
 
ISSN 



05562805
 
Volume/pages 



79:1(2009), p. 014504,1014504,12
 
ISI 



000262977900092
 
Full text (Publisher's DOI) 


  
Full text (open access) 


  
