Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant Peak of the 1/f Noise at the Metal-Insulator Transitions in Low-Tc
  CMR Manganites: Evidence of the Percolation Threshold at Tc   We observed a dramatic peak in the 1/f noise at the metal-insulator
transition (MIT) in low-Tc manganites. This many-orders-of-magnitude noise
enhancement is observed for both polycrystalline and single-crystal samples of
La{5/8-y}Pr{y}Ca{3/8}MnO{3} (y=0.35-0.4) in zero magnetic field and
Pr{1-x}Ca{x}MnO{3} (x=0.35-0.5) in magnetic field. This observation strongly
suggests that the microscopic phase separation in the low-Tc manganites causes
formation of a percolation network, and that the observed MIT is a percolation
threshold.

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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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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: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th