Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prediction of a new class of half-metallic antiferromagnets   We report on vacancy induced half-metallicity in the prototype
Mott-insulating substances MnO and NiO. By embedding a cation-vacancy into a
magnetic system a new road opens up to the construction of half-metallic
antiferromagnets. For Ni$_{0.97}$O we find a half-metallic antiferromagnet a
system hitherto only proposed for complicated crystal structures.

26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph