Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Physics – Condensed Matter – Superconductivity

Scientific paper

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5 pages, 3 figures, Fig.2 and text were modified. To appear in Phys. Rev. B (Rapid Comunication)

Scientific paper

10.1103/PhysRevB.69.180505

It is found on the basis of the lowest Landau level approach for the Ginzburg-Landau model that, in bulk type II superconductors with strong line disorder directed {\it perpendicularly} to an applied field, the continuous vortex-glass transition is depressed to the low $T$ limit in the limit of weak {\it point} disorder. An anomalous resistive broadening in twin-free YBCO with columnar defects in a field parallel to the layers is discussed based on this theoretical finding. Other phenomena which, we argue, arise indirectly from this mechanism in type II superconductors including correlated defects are also discussed.

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