Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray scattering study of two length scales in the critical fluctuations
  of CuGeO3   The critical fluctuations of CuGeO$_3$ have been measured by synchrotron
x-ray scattering, and two length scales are clearly observed. The ratio between
the two length scales is found to be significantly different along the $a$
axis, with the $a$ axis along the surface normal direction. We believe that
such a directional preference is a clear sign that surface random strains,
especially those caused by dislocations, are the origin of the long length
scale fluctuations.

30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio