Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity, Charge Orderings and Phase Separations in Systems
  with Local Electron Pairing   We study two effective models developed for description of superconductors
with short-coherence length: (i) the extended Hubbard model with on-site
attraction and intersite repulsion, (ii) the model of hard-core charged bosons
on a lattice. The analysis is concentrated on the problem of phase separations
and competition between superconductivity (SS) and charge-density-wave (CDW)
orderings. The phase diagrams of the systems are shown to consist of at least
seven different states, including 3 types of phase separated (PS) states:
CDW-SS (PS1), CDW-normal (PS2) and the state of electron droplets (PS3). By
taking into account the PS states and the effects of longer-range
density-density interactions (beyond nearest neighbours) our work substantially
generalizes and modifies the conclusions of previous works concerning the
models considered.

28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ