Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced magnetocaloric effect in a proximity of magnetization steps and
  jumps of spin-1/2 XXZ Heisenberg regular polyhedra   The magnetization process and adiabatic demagnetization of the
antiferromagnetic spin-1/2 XXZ Heisenberg clusters with the shape of regular
polyhedra (tetrahedron, octahedron, cube, icosahedron and dodecahedron) are
examined using the exact diagonalization method. It is demonstrated that a
quantum (xy) part of the XXZ exchange interaction is a primary cause for
presence of additional intermediate magnetization plateaux and steps, which are
totally absent in the limiting Ising case. The only exception to this rule is
the spin-1/2 XXZ Heisenberg tetrahedron, which shows just a quantitative shift
of the level-crossing fields related to two magnetization steps. It is
evidenced that the spin-1/2 XXZ Heisenberg regular polyhedra exhibit an
enhanced magnetocaloric effect in a proximity of the magnetization steps and
jumps, which are accompanied with a rapid drop (rise) of temperature just above
(below) of the level-crossing field when the magnetic field is removed
adiabatically.

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The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org