Geometrical Confinement Effects in Layered Mesoscopic Vortex Matter

N. R. CEJAS BOLECEK; M. I. DOLZ; A. B. KOLTON; H. PASTORIZA; C. J. VAN DER BEEK; M. KONCZYKOWSKI; M. MENGHINI; G. NIEVA; Y. FASANO

S. C. de Bariloche

Conferencia; "Advanced Topics in Magnetism and Superconductivity" (AToMS-2014) will be held in San Carlos de Bariloche, Patagonia Argentina, between the 31st of July and the 4th of August of 2014; 2014

Centro Atomico Bariloche, Instituto Balseiro

We study the geometrical confinement effect in Bi 2 Sr 2 CaCu 2 O 8+δ mesoscopic vortex matter with edge-to-surface ratio of 7?12 %. Samples have in-plane square and circular edges, 30 μ m widths, and ∼ 2 μ m thickness. Direct vortex imaging reveals the compact planes of the structure align with the sample edge by introducing topological defects. The defect density is larger for circular than for square edges. Molecular dynamics simulations suggest that this density is not an out-of-equilibrium property but rather determined by the geometrical confinement.