Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polar Jahn-Teller Centers and Isotope Effect in Copper Oxide
  high-T_c-Superconductors   The $CuO_4$-cluster based copper oxides are considered as generalized quantum
lattice bose-gas or a system of the local singlet bosons moving in a lattice of
the hole Jahn-Teller centers $[CuO_{4}^{5-}]_{JT}$. The model is illustrated by
the qualitative and quantitative description of the various peculiarities of an
isotope shift (IS-) effect in a series of 123-like oxides.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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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: nucl-ex
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The categories of this paper are: q-alg