Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.47: Poster

Dienstag, 26. Februar 2008, 14:00–18:00, Poster B

Reconstruction of the electric field distributions for flux dynamics studies in superconducting thin films — •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

It is well known that in type-II superconductors there are electric fields due to vortex motion. The space-resolved study allows for insights into the mechanism of vortex dynamics and the occurrence of local losses. This is an important and challenging problem for the development of high-current carrying applications with low electromagnetic losses. The electric field in high- T_c superconducting films is reconstructed employing magneto-optical imaging of the magnetic induction B_z(r) distributions. We developed a consistent method to calculate both dynamic and static contributions of the electric field, for a thin film in the so called perpendicular geometry. We investigate the contrasts between our technique, which employs magnetic relaxation measurements, and the theoretical scheme which requires an effective material law, E=ρ J, obtained from current transport experiments. Understanding the vortex dynamics in homogeneous superconducting films, provides a necessary background to study materials with complicate structures as patterned holes or inhomogeneous pinning.