Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robustness of basal-plane antiferromagnetic order and the $J_{eff}=1/2$
  state in single-layer iridate spin-orbit Mott insulators   The magnetic structure and electronic groundstate of the layered perovskite
Ba2IrO4 have been investigated using x-ray resonant magnetic scattering (XRMS).
Our results are compared with those for Sr2IrO4, for which we provide
supplementary data on its magnetic structure. We find that the dominant,
long-range antiferromagnetic order is remarkably similar in the two compounds,
and that the electronic groundstate in Ba2IrO4, deduced from an investigation
of the XRMS $L_3/L_2$ intensity ratio, is consistent with a $J_{eff}=1/2$
description. The robustness of these two key electronic properties to the
considerable structural differences between the Ba and Sr analogues is
discussed in terms of the enhanced role of the spin-orbit interaction in 5d
transition metal oxides.

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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga