Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-stage spin-flop transitions in S = 1/2 antiferromagnetic spin chain
  BaCu_2Si_2O_7   Two-stage spin-flop transitions are observed the in quasi-one-dimensional
antiferromagnet, BaCu${}_2$Si${}_2$O${}_7$. A magnetic field applied along the
easy axis induces a spin-flop transition at 2.0 T followed by a second
transition at 4.9 T. The magnetic susceptibility indicates the presence of
Dzyaloshinskii-Moriya (DM) antisymmetric interactions between the intrachain
neighboring spins. We discuss a possible mechanism whereby the geometrical
competition between DM and interchain interactions, as discussed for the
two-dimensional antiferromagnet La${}_2$CuO${}_4$, causes the two-stage
spin-flop transitions.

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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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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: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg