Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of nanosize BaZrO3 inclusions on vortex parameters in YBaCuO   We report on the field dependence of the microwave complex resistivity data
in YBa$_2$Cu$_3$O$_{7-x}$/BaZrO$_3$ films grown by PLD at various BaZrO$_3$
content. The data, analyzed within a recently developed general framework for
the mixed-state microwave response of superconductors, yield the field
dependence of the fluxon parameters such as the vortex viscosity and the
pinning constant. We find that pinning undergoes a change of regime when the
BaZrO$_3$ content in the target increases from 2.5 mol.% to 5 mol.%.
Simultaneously, the vortex viscosity becomes an increasing function of the
applied magnetic field. We propose a scenario in which flux lines are pinned as
bundles, and a crossover from dilute point pins to dense c-axis correlated
defects takes place between 2.5 and 5 mol.% in the BZO concentration. Our data
are inconsistent with vortices occupying mainly the BaZrO$_3$ sites at low
fields, and suggest instead that vortices occupy both BaZrO$_3$ sites and
interstitials in the YBa$_2$Cu$_3$O$_{7-x}$ matrix, even at low fields.

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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
1
The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex