Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Specific Heat Study of an S=1/2 Alternating Heisenberg Chain System
  F_5PNN Under Magnetic Field   We have measured the specific heat of an S=1/2 antiferromagnetic alternating
Heisenberg chain pentafulorophenyl nitronyl nitroxide under magnetic fields up
to H>H_C2. This compound has the field-induced magnetic ordered (FIMO) phase
between H_C1 and H_C2. Characteristic behaviors are observed depending on the
magnetic field up to above H_C2 outside of the H-T boundary for the FIMO.
Temperature and field dependence of the specific heat are qualitatively in good
agreement with the theoretical calculation on an S=1/2 two-leg ladder. [Wang et
al. Phys. Rev. Lett 84 5399 (2000)] This agreement suggests that the observed
behaviors are related with the low-energy excitation in the Tomonaga-Luttinger
liquid.

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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio