Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Twisted Ladder: relating the Fe superconductors to the high $T_c$
  cuprates   We construct a 2-leg ladder model of an Fe-pnictide superconductor and
discuss its properties and relationship with the familiar 2-leg cuprate model.
Our results suggest that the underlying pairing mechanism for the Fe-pnictide
superconductors is similar to that for the cuprates.

8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
9
The categories of this paper are: nlin