Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge order and phonon renormalizations: Possible implications for
  cobaltates   Several experimental and theoretical studies in cobaltates suggest the
proximity of the system to charge ordering (CO). We show, qualitatively, in the
frame of a $t-V$ model coupled to phonons that optical phonon modes at the $K$
and $M$ points of the Brillouin zone, which involves only $O$-ions displacement
around a $Co$-ion, are good candidates to display anomalies due to the CO
proximity. If by increasing of $H_2O$ content the system is pushed closer to
CO, the mentioned phonon modes should show softening and broadening.

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The categories of this paper are: supr-con
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
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The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn