Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic order and spin excitations in layered Heisenberg
  antiferromagnets with compass-model anisotropies   The spin-wave excitation spectrum, the magnetization, and the N\'{e}el
temperature for the quasi-two-dimensional spin-1/2 antiferromagnetic Heisenberg
model with compass-model interaction in the plane proposed for iridates are
calculated in the random phase approximation. The spin-wave spectrum agrees
well with data of Lanczos diagonalization. We find that the Neel temperature is
enhanced by the compass-model interaction and is close to the experimental
value for Ba2IrO4.

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The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: stat
7
The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat