Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The magnetism of wurtzite CoO nanoclusters   The possibility that the apparent room temperature ferromagnetism, often
measured in Co-doped ZnO, is due to uncompensated spins at the surface of
wurtzite CoO nanoclusters is investigated by means of a combination of density
functional theory and Monte Carlo simulations. We find that the critical
temperature extracted from the specific heat systematically drops as the
cluster size is reduced, regardless of the particular cluster shape.
Furthermore the presence of defects, in the form of missing magnetic sites,
further reduces $T_\mathrm{C}$. This suggests that even a spinodal decomposed
phase is unlikely to sustain room temperature ferromagnetism in ZnO:Co.

29
The categories of this paper are: funct-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int