Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Scaling Behavior of Spectral Weight Changes in Perovskite Manganites
  La_{0.7-y}Pr_{y}Ca_{0.3}MnO_3   Optical conductivity spectra of La_{0.7-y}Pr_{y}Ca_{0.3}MnO_3 were
systematically investigated. For metallic samples, the spectral weight below
0.5 eV, whose magnitude can be represented by the effective carrier number
N_{eff}(0.5 eV), increases as temperature becomes lower. Regardless of the Pr
doping, all the measured values of N_{eff}(0.5 eV)/T_C fall into one scaling
curve. This scaling behavior could be explained by the theoretical model by
Roeder et al. [Phys. Rev. Lett. 76, 1356 (1996)], which includes spin double
exchange and Jahn-Teller lattice coupling to holes. With the Pr doping,
far-infrared conductivities were found to be suppressed, probably due to the
Anderson localization.

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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: physics