Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nodal versus nodeless superconductivity in iso-electronic LiFeP and
  LiFeAs   Nodal superconductivity is observed in LiFeP while its counterpart LiFeAs
with similar topology and orbital content of the Fermi surfaces is a nodeless
superconductor. We explain this difference by solving, in the two-Fe Brillouin
zone, the frequency-dependent Eliashberg equations with spin-fluctuation
mediated pairing interaction. Because of Fermi surface topology details, in
LiFeAs all the Fe-$t_{2g}$ orbitals favor a common pairing symmetry. By
contrast, in LiFeP the $d_{xy}$ orbital favors a pairing symmetry different
from $d_{xz/yz}$ and their competition determines the pairing symmetry and the
strength of the superconducting instability: $d_{xy}$ orbital strongly
overcomes the others and imposes the symmetry of the superconducting order
parameter. The leading pairing channel is a $d_{xy}$-type state with nodes on
both hole and electron Fermi surfaces. As a consequence, the $d_{xz/yz}$
electrons weakly pair leading to a reduced transition temperature in LiFeP.

5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci