Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Postersitzung I: Supraleitung
TT 8.29: Poster
Montag, 8. März 2004, 14:30–19:00, Poster A
Guided vortex motion in Nb films on facetted substrate surfaces — •Oleksiy K. Soroka1, Michael Huth2, Valerij A. Shklovskij3, Jens Oster1, and Hermann Adrian1 — 1Institute of Physics, Johannes Gutenberg-University, Staudinger Weg 7, D-55099 Mainz, Germany — 2Institute of Physics, Johann Wolfgang Goethe-University, Robert-Mayer-Str. 2-4, D-60054 Frankfurt/M., Germany — 3Kharkov State University, Physical Department, 4 Svobody Sq.,61077, Kharkov, Ukraine
In the case of anisotropy of the viscous damping force in superconductors a guided motion of vortices can take place. This means there exists a preferred direction for the vortices to move in such superconductors. Guided vortex motion leads to the appearance of new components in the galvanomagnetic properties of the sample. One can observe an additional odd magnetoresistive component with respect to magnetic field reversal. Furthermore, an even contribution to the transverse (Hall) voltage emerges.
Guided motion of vortices in Nb films on facetted α-Al2O3 (1010) was observed by measuring the longitudinal and transversal resistivities of the sample. The thin film sample consisted of five microbridges oriented at the angles 0∘, 30∘, 45∘, 60∘ and 90∘ with respect to the facet ridges. Field inversion was used to separate the even and odd components of the measured magnetoresistivities to obtain the contributions caused by the guided vortex motion. The guiding angle was measured for the different current orientations. Anomalous Hall effect, i.e. the sign reversal of the Hall resistivity was found.