Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-Temperature Properties of the Randomly Depleted Heisenberg Ladder   Low-temperature thermodynamic properties of the spin-1/2 Heisenberg ladder
system with non-magnetic impurities are discussed using an effective
Hamiltonian for the impurity-induced spins in the background of a spin liquid
with a gap. It is shown that the uniform susceptibility shows Curie-like
behavior in high-, intermediate-, and low-temperature regimes, with three
different Curie constants. The ratio of specific heat to temperature, C/T, is
divergent in the low-temperature limit, reflecting a singular distribution of
the effective couplings among the impurity spins.

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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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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: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin