Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced ferromagnetism from electron-electron interactions in double
  exchange type models   The magnetic properties of a variety of materials with promise for
technological applications have been described by models in which fermions are
coupled to local moment spins. Monte Carlo studies of such models usually
ignore electron-electron interactions, even though the energy scale
corresponding to these interactions may be comparable to or larger than other
relevant energy scales. In this work we add on-site interactions between
fermions to the double exchange model which we study with a Monte Carlo scheme
in which temporal fluctuations of local moment spins are fully accounted for
and electron-electron interactions are treated at a mean field level. We show
that when the number of fermions is considerably less than the number of local
moments even moderate interactions can lead to significant enhancement of
ferromagnetism and the Curie temperature.

22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat