Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hall resistivity in unconventional spin density wave in (TMTSF)2PF6
  below T=4.2K   It is well documented that SDW in (TMTSF)2PF6 undergoes another phase
transition at T*\approx 4K, though the nature of the new low temperature phase
is controversial. We have shown recently that the new phase is well described
in terms of unconventional SDW (USDW) which modifies the quasiparticle spectrum
dramatically. In this paper we show that the same model describes consistently
the Hall resistivity observed in (TMTSF)2PF6.

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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: cs