Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural, electronic, and magnetic properties of nearly-ideal $J_{\rm
  eff}$ $=$ 1/2 iridium halides   Heavy transition metal magnets with $J_{\rm eff}$ $=$ 1/2 electronic ground
states have attracted recent interest due to their penchant for hosting new
classes of quantum spin liquids and superconductors. Unfortunately, model
systems with ideal $J_{\rm eff}$ $=$ 1/2 states are scarce due to the
importance of non-cubic local distortions in most candidate materials. In this
work, we identify a family of iridium halide systems [i.e. K$_2$IrCl$_6$,
K$_2$IrBr$_6$, (NH$_4$)$_2$IrCl$_6$, and Na$_2$IrCl$_6 \cdotp $ 6(H$_2$O)] with
Ir$^{4+}$ electronic ground states in extremely close proximity to the ideal
$J_{\rm eff}$ $=$ 1/2 limit, despite a variation in the low-temperature global
crystal structures. We also find ordered magnetic ground states for the three
anhydrous systems, with single crystal neutron diffraction on K$_2$IrBr$_6$
revealing Type-I antiferromagnetism. This spin configuration is consistent with
expectations for significant Kitaev exchange in a face-centered-cubic magnet.

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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: math