Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stoichiometric YFe2O4-\delta\ single crystals grown by the optical
  floating zone method   We report the growth of YFe2O4-\delta\ single crystals by the optical
floating zone method, showing for the first time the same magnetization as
highly stoichiometric (\delta = 0.00) powder samples and sharp superstructure
reflections in single crystal x-ray diffraction. The latter can be attributed
to three dimensional long-range charge ordering. Resonant x-ray diffraction at
the Fe K-edge with full linear polarization analysis was used for the
investigation of the possibility of orbital order.

17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys