Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical analysis of the double spin chain compound KCuCl_3   We investigate thermal and magnetic properties of the double spin chain
compound KCuCl_3 via an exactly solved ladder model with strong rung
interaction. Results from the analysis of the thermodynamic Bethe Ansatz
equations suggests the critical field values H_{c1}=22.74T and H_{c2}=51.34T,
in good agreement with the experimental observations. The temperature dependent
magnetic properties are directly evaluated from the exact free energy. Good
overall agreement is seen between the theoretical and experimental
susceptibility curves. Our results suggest that this compound lies in the
strong dimerized phase with an energy gap $\Delta \approx 35$K at zero
temperature.

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The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom