Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic structure of semiconducting CeFe$_4$P$_{12}$: Strong
  hybridization and relevance of single-impurity Anderson model   Semiconducting skutterudite CeFe$_4$P$_{12}$ is investigated by synchrotron
x-ray photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS).
Ce 3$d$ core-level PES and 3$d-4f$ XAS, in combination with single impurity
Anderson model (SIAM) calculations, confirm features due to $f^0$, $f^1$ and
$f^2$ configurations. The Ce 4$f$ density of states (DOS) indicates absence of
a Kondo resonance at Fermi level, but can still be explained by SIAM with a
small gap in non-$f$ DOS. While Ce 4$f$ partial DOS from band structure
calculations are also consistent with the main Ce 4$f$ DOS, the importance of
SIAM for core and valence spectra indicates Kondo semiconducting mixed valence
for CeFe$_4$P$_{12}$, derived from strong hybridization between non-$f$
conduction and Ce 4$f$ DOS.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio