Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice and magnetic dynamics in YVO$_{3}$ Mott insulator studied by
  neutron scattering and first-principles calculations   The Mott insulator YVO$_{3}$ with $T_{N}$ = 118 K is revisited to explore the
role of spin, lattice and orbital correlations across the multiple structural
and magnetic transitions observed as a function of temperature. Upon cooling,
the crystal structure changes from orthorhombic to monoclinic at 200 K, and
back to orthorhombic at 77 K, followed by magnetic transitions. From the
paramagnetic high temperature phase, C-type ordering is first observed at 118
K, followed by a G-type spin re-orientation transition at 77 K. The dynamics of
the transitions were investigated via inelastic neutron scattering and first
principles calculations. An overall good agreement between the neutron data and
calculated spectra was observed. From the magnon density of states, the
magnetic exchange constants were deduced to be $J_{ab}$ = $J_{c}$ = -5.8 meV in
the G-type spin phase, and $J_{ab}$ = -3.8 meV, $J_{c}$ = 7.6 meV at 80 K and
$J_{ab}$ = -3.0 meV, $J_{c}$ = 6.0 meV at 100 K in the C-type spin phase.
Paramagnetic scattering was observed in the spin ordered phases, well below the
C-type transition temperature, that continuously increased above the
transition. Fluctuations in the temperature dependence of the phonon density of
states were observed between 50 and 80 K as well, coinciding with the G-type to
C-type transition. These fluctuations are attributed to optical oxygen modes
above 40 meV, from first principles calculations. In contrast, little change in
the phonon spectra is observed across $T_{N}$.

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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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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: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg