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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4269

Title: Pinning action of correlated disorder against equilibrium properties of HgBa2Ca2Cu3Ox
Authors: Thompson, J.R.
Ossandon, J.G.
Krusin-Elbaum, L.
Christen, D.K.
Kim, H.J.
Song, K.J.
Sorge, K.D.
Ullmann, J.L.
Keywords: T-C Superconductors; Critical-Current Densities; Splayed Columnar
Issue Date: 2004
Citation: Physical Review B 69(10):10
Abstract: We report significant alteration of the equilibrium properties of the superconductor HgBa$_2$Ca$_2$Cu$_3$O$_x$ when correlated disorder in the form of randomly oriented columnar tracks is introduced via induced fission of Hg-nuclei. From studies of the equilibrium magnetization $M_{eq}$ and the persistent current density over a wide range of temperatures, applied magnetic fields, and track densities up to a ``matching field'' of 3.4 Tesla, we observe that the addition of more columnar tracks acting as pinning centers is progressively offset by reductions in the magnitude of $M_{eq}$. Invoking anisotropy induced ``refocusing'' of the random track array and incorporating vortex-defect interactions, we find that this corresponds to increases in the London penetration depth $\lambda$; this reduces the vortex line energy and consequently reduces the pinning effectiveness of the tracks.
Description: Ossandon, J.G. Department of Engineering Sciences, Universidad de Talca, Curicó, Chile.
URI: http://dspace.utalca.cl/handle/1950/4269
ISSN: 1098-0121
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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