Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the existence of circulating currents in high-$T_c$
  superconductors using the polarized neutron scattering technique   We review experimental attempts using polarized neutron scattering technique
to reveal the existence in high temperature superconductors of a long-range
ordered state characterized by the spontaneous appearance of current loops. We
draw a particular attention to our recent results (B. Fauqu\'e {\it et al.},
{\it Phys. Rev. Lett.} {\bf 96}, 197001 (2006)) that, up to now, can be
explained only by the theory of circulating current proposed by C.M. Varma.

29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
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
0
The categories of this paper are: hep-ph