Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermodynamic properties of a diluted Heisenberg ferromagnet with
  interaction anisotropy -- magnetocaloric point of view   The thermodynamics of a site-diluted ferromagnetic Heisenberg model for spin
$S=1/2$ with interaction anisotropy in spin space is investigated. The study is
aimed at presenting the magnetocaloric properties of such a model, including
the entropy and temperature changes in magnetization/demagnetization processes,
generalized Gr\"uneisen ratio as well as the quantities characterizing the
efficiency of magnetic cooling cycles. The results are obtained using Pair
Approximation (PA) method and extensively compared with the Molecular Field
Approximation (MFA) calculations. The importance of interaction anisotropy and
site-dilution is discussed. The inadequacy of the MFA approach (even on the
qualitative level) is found for selected quantities, while PA provides the
results which are consistent with the experimentally observed behaviour.

33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs