Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Collinear Magnetic Phases of a Triangular-Lattice Antiferromagnet
  and Doped CuFeO$_2$   We obtain the non-collinear ground states of a triangular-lattice
antiferromagnet with exchange interactions up to third nearest neighbors as a
function of the single-ion anisotropy $D$. At a critical value of $D$, the
collinear $\uudd $ phase transforms into a complex non-collinear phase with
odd-order harmonics of the fundamental ordering wavevector $\vQ $. The observed
elastic peaks at $2\pi \vx -\vQ $ in both Al- and Ga- doped CuFeO$_2$ are
explained by a "scalene" distortion of the triangular lattice produced by the
repulsion of neighboring oxygen atoms.

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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
1
The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
10
The categories of this paper are: q-bio