Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pinning Action of Correlated Disorder against Equilibrium Properties of
  HgBa$_2$Ca$_2$Cu$_3$O$_x$: a Delicate Balance   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.

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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th