Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inelastic light scattering in the spin cluster Mott insulator
  Cu$_{2}$OSeO$_{3}$   Clusters of single spins form the relevant spin entities in the formation of
long-range magnetic order in spin cluster Mott insulators. Such type of spin
order bears resemblance to molecular crystals, and we therefore may expect a
prototypical spin wave spectrum which can be divided into low-energy external
and high-energy internal cluster spin wave modes. Here, we study high-energy
spin cluster excitations in the spin cluster Mott insulator Cu$_{2}$OSeO$_{3}$
by means of spontaneous Raman scattering. Multiple high-energy optical magnon
modes are observed, of which the Raman-activity is shown to originate in the
Elliot-Loudon scattering mechanism. Upon crossing the long-range ordering
transition temperature the magnetic modes significantly broaden, corresponding
to scattering from localized spin excitations within the spin clusters.
Different optical phonon modes show a strong temperature dependence, evidencing
a strong magnetoelectric coupling between optical phonons and the high-energy
spin cluster excitations. Our results support the picture that
Cu$_{2}$OSeO$_{3}$ can be regarded as a solid-state molecular crystal of spin
nature.

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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th