Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dimensional crossover and the magnetic transition in electron doped
  manganites   We introduce a microscopic model for electron doped manganites that explains
the mechanism of the observed transition from $G$-type antiferromagnetic
($G$-AF) to $C$-type antiferromagnetic ($C$-AF) order under increasing doping
by double exchange mechanism. The model unravels the crucial role played by
$e_g$ orbital degrees of freedom and explains the observed metal-to-insulator
transition by a dimensional crossover at the magnetic phase transition. The
specific heat and the spin canting angle found for the $G$-AF phase agree with
the experimental findings. As a surprising outcome of the theory we find that
spin canting is suppressed in the $C$-AF phase, in agreement with the
experiment, due to the Fermi surface topology.

12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph