Physics – Condensed Matter – Superconductivity
Scientific paper
2003-09-08
Physics
Condensed Matter
Superconductivity
8 pages, 9 figures
Scientific paper
10.1103/PhysRevB.69.104520
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.
Christen David K.
Kim Hyeong-Jin
Krusin-Elbaum L.
Ossandon J. G.
Song Kim Jin
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