Regensburg 2002 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 4: Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen
TT 4.8: Vortrag
Montag, 11. März 2002, 16:15–16:30, H18
Guided vortex motion in Nb films on facetted substrate surfaces — •Oleksiy K. Soroka1, Michael Huth1, Valerij A. Shklovskij2, Jens Oster1, and Hermann Adrian1 — 1Institute of Physics, Johannes Gutenberg-Universitaet, Staudinger Weg 7, D-55099 Mainz, Germany — 2National Science Center "Kharkov Institute of Physics and Technology", Institute of Theoretical Physics, 1 Akademicheskaya St., 67108, Kharkiv, Ukraine
Anisotropy of the viscous damping force of vortex motion in superconductor can cause a guiding effect on the vortices. Such a guided vortex motion leads to the appearance of new components in the galvanomagnetic properties of the sample. In this case one can observe an additional odd magnetoresistive component with respect to magnetic field reversal. Furthermore, an even contribution to the Hall voltage is observed.
Guided motion of vortices in Nb films on facetted α−Al2O3 (1010) was found by measuring the longitudinal and transversal resistivities of three identical films with transport current directed parallel, perpendicular and at an angle 450 with respect to the facet ridges. Field inversion was used to separate the even and odd components of the measured magnetoresistivities to obtain contributions caused by the guided vortex motion.