Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of deoxygenation on the weak link behavior of YBCO
  superconductors   A systematic study of the weak- link behavior for YBa2Cu3O7-d polycrystalline
samples has been done using the electrical resistivity and AC susceptibility
techniques.The experiments were performed with two samples of similar grain, a
sample of well-coupled grains, and a deoxygenated sample in such a way that the
oxygen mostly come from the intergrain region. Analysis of the temperature
dependence of the AC susceptibility near the transition temperature (Tc) has
been done employing Bean critical state model. The observed variation of
intergranular critical current densities(Jc)with temperature indicates that the
weak links are changed from superconductor- normal metal-superconductor(SNS)
for well-coupled sample to superconductor-insulator- normal
metal-superconductor(SINS) type of junctions for the deoxygenated sample.These
results are interpreted in terms of oxygen depletion from grain boundaries,
which in turn decreases the intergranular Josephson coupling energy with a
consequent decrease ofpinning of the intergranular vortices.

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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
1
The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph