Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solid state Pomeranchuk effect   Recently we have shown that $YbInCu_4$ and related compounds present a solid
state Pomeranchuk effect. These systems have a first order volume transition
where a local moment phase coexists with a renormalized Fermi liquid in analogy
with $^3He$ at its melting curve. We demonstrate here experimentally that the
solid state Pomeranchuk effect, controlled by a magnetic field, can be used to
produce cooling.

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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: gr-qc