Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doping induced spin state transition in Li$_x$CoO$_2$ as studied by the
  GGA+DMFT calculations   Magnetic properties of Li$_x$CoO$_2$ for $x = 0.94, 0.75, 0.66$ and $0.51$
were investigated in frames of method combining Generalized Gradient
Approximation with Dynamical Mean--Field Theory (GGA+DMFT). We found that a
delicate interplay between Hund's exchange energy and $t_{2g}-e_g$ crystal
field splitting is responsible for the high spin to low spin state transition
for Co$^{4+}$ ions. The GGA+DMFT calculations show that at small doping level
the Co$^{4+}$ ions adopt high spin state, while delithiation results in
increase of the crystal field splitting and low spin state becomes preferable.
The Co$^{3+}$ ions were found to stays in the low spin configuration for any
$x$.

21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs