Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Magnetic Flux Generated Spontaneously During a Rapid
  Quench of Superconducting Films   We report observations of spontaneous formation of magnetic flux lines during
a rapid quench of YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ films through T$_{c}$. This
effect is predicted according to the Kibble-Zurek mechanism of creation of
topological defects of the order parameter during a symmetry-breaking phase
transition. Our previous experiment, at a quench rate of 20K/sec, gave null
results. In the present experiment, the quench rate was increased to
\TEXTsymbol{>} 10$^{8}$ K/sec. Within experimental resolution, the dependence
of the measured flux on the cooling rate is consistent with the prediction.

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The categories of this paper are: funct-an
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg