Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning

TT 26.8: Vortrag

Mittwoch, 27. Februar 2008, 17:45–18:00, H 3010

Flux dynamics in superconductors with columnar array of artificial defects — •Carolina Romero-Salazar¹, Omar Augusto-Flores², and Christian Jooss¹ — ¹Institut fuer Materialphysik, Friedrich Hund Platz 1, 37077 Goettingen, Germany — ²Instituto de Fisica, Universidad Autonoma de Puebla, Apdo. Post. J-48, Puebla, Mexico

In this work we extend the analysis of the dynamic properties in thin film superconductors to more complicate materials, with patterned holes or areas with locally enhanced pinning. Understanding how interactions of ensembles of vortices with artificial holes or inhomogeneous pinning take place have implications for possible technological applications, based on controlled-transport of vortices. Employing our electric field reconstruction method, we perform experimental and theoretical studies on BSSCO single crystals, where columnar defects (strong vortex attractors) are presented in cylindrical regions of 100 µ m diameter. The columnar defects were created by high-energy ion irradiation [1] A better understanding of vortex dynamics in presence of inhomogeneities is necessary to learn about local losses. We observe that in inhomogeneous superconductors, the vector velocity is not strictly parallel to the Lorentz force.

[1] S.S Banerjee et al Phys. Rev. Lett. 93 097002 (2004).