Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of symmetry and structure of the gap in Fe-based
  superconductors with doping and interactions   We present a detailed study of the symmetry and structure of the pairing gap
in Fe-based superconductors (FeSC). We treat FeSC as quasi-2D, decompose the
pairing interaction in the XY plane in s-wave and d-wave channels into
contributions from scattering between different Fermi surfaces and analyze how
each scattering evolves with doping and input parameters. We verify that each
interaction is well approximated by the lowest angular harmonics. We use this
simplification to analyze the interplay between the interaction with and
without spin-fluctuation components, the origin of the attraction in the
s+/-and d_{x2-y2} channels, the competition between them, the angular
dependence of the s+/- gaps along the electron Fermi surface, the conditions
under which s+/- gap develops nodes, and the origin of superconductivity in
heavily electron- or hole-doped systems, when only Fermi surfaces of one type
are present. We also discuss the relation between RPA and RG approaches for
FeSC.

26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th