Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in Multi-orbital t-J1-J2 Model and its Implications
  for Iron Pnictides   Motivated by the bad metal behavior of the iron pnictides, we study a
multi-orbital $\mathrm{t-J_1-J_2}$ model and investigate possible singlet
superconducting pairings. Magnetic frustration by itself leads to a large
degeneracy in the pairing states. The kinetic energy breaks this into a
quasi-degeneracy among a reduced set of pairing states. For small electron and
hole Fermi pockets, an $A_{1g}$ state dominates over the phase diagram but a
$B_{1g}$ state has close-by energy. In addition to the nodeless $A_{1g}$
$s_{x^2y^2}$ channel, the nodal $A_{1g}$ $s_{x^2+y^2}$ and $B_{1g}$
$d_{x^2-y^2}$ channels are also competitive in the magnetically frustrated $J_1
\sim J_2$ parameter regime. An $A_{1g}+i B_{1g}$ state, which breaks
time-reversal symmetry, occurs at low temperatures in part of the phase
diagram. Implications for the experiments in the iron pnictides are discussed.

7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org