Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Importance of dxy orbital and electron correlation in iron-based
  superconductors revealed by phase diagram for 1111-system   The structural flexibility at three substitution sites in LaFeAsO enabled
investigation of the relation between superconductivity and structural
parameters over a wide range of crystal compositions. Substitutions of Nd for
La, Sb or P for As, and F or H for O were performed. All these substitutions
modify the local structural parameters, while the F/H-substitution also changes
band filling. It was found that the superconducting transition temperature
$T_{c}$ is strongly affected by the pnictogen height $h_{Pn}$ from the Fe-plane
that controls the electron correlation strength and the size of the $d_{xy}$
hole Fermi surface (FS). With increasing $h_{Pn}$, weak coupling
superconductivity switches to the strong coupling one where the $d_{xy}$ hole
FS is crucially important.

36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys