Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Antiferromagnetic correlations in the metallic strongly correlated
  transition metal oxide LaNiO$_3$   The material class of rare earth nickelates with high Ni$^{3+}$ oxidation
state is generating continued interest due to the occurrence of a
metal-insulator transition with charge order and the appearance of
non-collinear magnetic phases within this insulating regime. The recent
theoretical prediction for superconductivity in LaNiO$_3$ thin films has also
triggered intensive research efforts. LaNiO$_3$ seems to be the only rare earth
nickelate that stays metallic and paramagnetic down to lowest temperatures. So
far, centimetre-sized impurity-free single crystal growth has not been reported
for the rare earth nickelates material class since elevated oxygen pressures
are required for their synthesis. Here, we report on the successful growth of
centimetre-sized LaNiO$_3$ single crystals by the floating zone technique at
oxygen pressures of up to 150 bar. Our crystals are essentially free from
Ni$^{2+}$ impurities and exhibit metallic properties together with an
unexpected but clear antiferromagnetic transition.

27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th