Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on Microscopic magnetic modeling for the S = 1/2 alternating
  chain compounds Na3Cu2SbO6 and Na2Cu2TeO6 (arXiv:1402.1091)   In a recent paper by Schmitt et al. (arXiv:1402.1091), signs of two exchange
interactions of one-dimensional alternating chains in distorted honeycomb
systems of Na3Cu2SbO6 and Na2Cu2TeO6 are argued by theoretical calculations.
Although the authors report that they have clarified that the interaction J1a
is ferromagnetic between the spins within a structural dimer, and J1b is
antiferromagnetic between these dimers, these results have been known for a
long time by our two papers, which are cited by Schmitt et al.

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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
3
The categories of this paper are: physics
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The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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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: cs
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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: dg-ga
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The categories of this paper are: chem-ph