Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct observation of quasi-particle band in CeIrIn$_5$: Angle-resolved
  photoemission spectroscopy study   We have performed a high-resolution angle resolved Ce 4$d-4f$ resonant
photoemission experiment on the heavy fermion superconductor CeIrIn$_5$. We
have observed a quasi-particle band which has an energy dispersion of $\sim 30$
meV in the Ce 4$f$ on-resonance spectra. The result suggests that although the
4$f$ spectra are dominated by the localized/correlated character, the small
itinerant component is responsible for the superconductivity in this compound.

28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
19
The categories of this paper are: eess