Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-enhanced magnetocaloric effect in molecular nanomagnets   An unusually large magnetocaloric effect for the temperature region below 10
K is found for the Fe14 molecular nanomagnet. This is to large extent caused by
its extremely large spin S ground-state combined with an excess of entropy
arising from the presence of low-lying excited S states. We also show that the
highly symmetric Fe14 cluster core, resulting in small cluster magnetic
anisotropy, enables the occurrence of long-range antiferromagnetic order below
T_N=1.87 K.

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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: stat
18
The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
2
The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: cs