Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 11, Pages 2372-2375Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.2372
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We examine the vortex states in a 2D superconductor interacting with a square array of pinning sites. As a function of increasing pinning size or strength we find a series of novel phases including multivortex and composite superlattice states such as aligned dimer and trimer configurations at individual pinning sites. Interactions of the vortices give rise to an orientational ordering of the internal vortex structures in each pinning site. We also show that these vortex states can give rise to a multistage melting behavior.
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