Flux pinning and dissipation in high-temperature superconductors

Gray, K. E.; Kim, D. H.

doi:10.1016/0921-4534(91)90653-g

Flux pinning and dissipation in high-temperature superconductors

Conference · Sun Sep 01 00:00:00 EDT 1991 · Physica. C, Superconductivity

DOI:https://doi.org/10.1016/0921-4534(91)90653-g· OSTI ID:5553952

Gray, K. E.; Kim, D. H.

The effect of anisotropy on the field-induced broadening of resistive transitions in the highly-anisotropic high-temperature superconductors (HTS) is considered. For the applied field, H, parallel to the superconducting Cu-O layers the absence of a Lorentz-force, together with intrinsic pinning of the insulating region between layers, leads to an explanation other than flux motion. However, for H parallel to the c-axis, the lack of intrinsic pinning implies that the much greater broadening is due to thermally-activated flux motion. We show experimental evidence that the associated flux motion occurs as a result of a crossover from three dimensional (3D) vortex lines to 2D independent pancake-like vortices, residing in the Cu-O layers. This 3D to 2D crossover occurs when k_BT exceeds the Josephson coupling energy. For YBa₂Cu₃O₇, this dimensional crossover does not occur below H_c2, presumably because the conducting Cu-O chains short circuit the Josephson interlayer coupling.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

DOE Contract Number:: W-31109-ENG-38

OSTI ID:: 5553952

Report Number(s):: ANL/CP--73158; CONF-910410--1; ON: DE91014466

Journal Information:: Physica. C, Superconductivity, Journal Name: Physica. C, Superconductivity Journal Issue: 1-4 Vol. 180; ISSN 0921-4534

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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Flux pinning and dissipation in high-temperature superconductors

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