Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetism and charge density waves in RNiC$_2$ (R = Ce, Pr, Nd)   We have compared the magnetic, transport, galvanomagnetic and specific heat
properties of CeNiC$_2$, PrNiC$_2$ and NdNiC$_2$ to study the interplay between
charge density waves and magnetism in these compounds. The negative
magnetoresistance in NdNiC$_2$ is discussed in terms of the partial destruction
of charge density waves and an irreversible phase transition stabilized by the
field induced ferromagnetic transformation is reported. For PrNiC$_2$ we
demonstrate that the magnetic field initially weakens the CDW state, due to the
Zeeman splitting of conduction bands. However, the Fermi surface nesting is
enhanced at a temperature related to the magnetic anomaly.

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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: math