Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ferromagnetic and random spin ordering in diluted magnetic
  semiconductors   In a diluted magnetic semiconductor system, the exchange interaction between
magnetic impurities has two independent components: a direct antiferromagnetic
interaction and a ferromagnetic interaction mediated by charge carriers.
Depending on the system parameters, the ground state of the system may be
ordered either ferromagnetically or randomly. In this paper we use percolation
theory to find the ferromagnetic transition temperature and the location of the
quantum critical point separating the ferromagnetic phase and a valence bond
glass phase.

13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas