Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 33: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning

TT 33.6: Talk

Friday, March 31, 2006, 11:30–11:45, HSZ 304

Anisotropic temperature-dependent current densities in vicinal YBCO — •Märit Djupmyr and Joachim Albrecht — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart

Thin epitaxial films of YBa₂Cu₃O_7−δ grown on vicinal cut substrates exhibit a substantial anisotropy of the critical current density j_c in the film plane. By means of quantitative magneto-optical analysis it is possible to independently investigate the current densities along the two occurring current directions. A detailed analysis of the temperature dependence of the critical currents in the range of T=5−90 K will be shown. Completely different behavior of j_c(T) along the different directions were found. Describing the data by a step-wise power-law ansatz allows to distinguish between different current limiting mechanisms like thermal depinning and depairing which are important in different temperature ranges.

[1] S. Brück and J. Albrecht, Phys. Rev. B 71, 174508 (2005)

[2] M. Djupmyr, G. Cristiani, H.-U. Habermeier and J. Albrecht, Phys. Rev. B, submitted