Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetization Decay due to Vortex Phase Boundary Motion in BSCCO   We identify a new regime of decay of the irreversible magnetization in clean
Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ crystals, at induction values close to the
``second peak field'' at which the bulk critical current density steeply
increases. A time window is identified during which the decay of the induction
is controlled by the slow propagation of the phase transformation front across
the sample.

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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex