Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetism and Superconductivity in Iron-based Superconductors Decided by
  Condensed Particle-hole Excitations away from the Fermi Level   The origin of magnetism and superconductivity in iron-based superconductors
is still unclear. Here, by investigating the momentum-dependent particle-hole
excitations which quantify the tendency of itinerant electrons towards various
magnetic states or superconducting phases, we unravel a novel origin to account
for the variety of physical properties of iron-based compounds. We show that
condensation of particle-hole excitations away from the Fermi surface in
momentum space is the underlying mechanism in deciding the magnetic and
superconducting properties of iron-based materials. The applicability of this
scenario to the whole family of iron-based superconductors suggests that
inclusion of the orbital degrees of freedom, which may lead to competing
tendencies towards different magnetically ordered states, is more crucial than
taking into account the strong correlations. Our findings further indicate that
in order to properly model these materials, the electronic states away from the
Fermi level have to be considered.

16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
2
The categories of this paper are: math