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Vortex wandering among splayed columnar defects
2001 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 6414, no 14Article in journal (Refereed) Published
Abstract [en]

We investigate the scaling properties of single flux lines in a random pinning landscape consisting of splayed columnar defects. Such correlated defects can be injected into type II superconductors by inducing nuclear fission or via direct heavy ion irradiation. The result is often very efficient pinning of the vortices which gives, e.g., a strongly enhanced critical current. The wandering exponent zeta and the free energy exponent omega of a single flux line in such a disordered environment are obtained analytically from scaling arguments combined with extreme-value statistics. In contrast to the case of point disorder, where these exponents Lire universal, we find a dependence of the exponents on details in the probability distribution of the low lying energies of the columnar defects. The analytical results show excellent agreement with numerical transfer matrix calculations in two and three dimensions.

Place, publisher, year, edition, pages
2001. Vol. 6414, no 14
Keyword [en]
high-temperature superconductors, flux-line, yba2cu3o7 crystals, directed polymers, disorder, configurations, irradiation, behavior, physics, motion
URN: urn:nbn:se:kth:diva-21011ISI: 000171530000085OAI: diva2:339708
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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