Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergent excitation at the magnetic metal-insulator transition in the
  pyrochlore osmate Cd2Os2O7   The rich physics manifested by 5d oxides falls outside the Mott-Hubbard
paradigm used to successfully explain the electronic and magnetic properties of
3d oxides. Much consideration has been given to the extent to which strong
spin-orbit coupling (SOC), in the limit of increased bandwidth and reduced
electron correlation, drives the formation of novel electronic states, as
manifested through the existence of metal-insulator transitions (MITs). SOC is
believed to play a dominant role in 5d5 systems such as iridates (Ir4+),
undergoing MITs which may or may not be intimately connected to magnetic order,
with pyrochlore and perovksite systems being examples of the former and latter,
respectively. However, the role of SOC for other 5d configurations is less
clear. For example, 5d3 (e.g Os5+) systems are expected to have an orbital
singlet and consequently a reduced effect of SOC in the groundstate. The
pyrochlore osmate Cd2Os2O7 nonetheless exhibits a MIT intimately entwined with
magnetic order with phenomena similar to pyrochlore iridates. Here we report
the first resonant inelastic X-ray scattering (RIXS) measurements on an osmium
compound, allowing us to determine the salient electronic and magnetic energy
scales controlling the MIT in Cd2Os2O7, which we benchmark against detailed
quantum chemistry calculations. In particular, we reveal the emergence at the
MIT of a magnetic excitation corresponding to a superposition of multiple
spin-flip processes from an Ising-like all-in/all-out magnetic groundstate. We
discuss our results with respect to the role of SOC in magnetically mediated
MITs in 5d systems

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The categories of this paper are: quant-ph
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The categories of this paper are: econ
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas