Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Advances in the criteria for dividing thin superconducting films into
  narrow and wide films   The results of experimental investigations of the critical currents and
certain nonequilibrium phenomena in thin Sn films of different width w are
analyzed. Usually, thin superconducting films are divided into two groups:
narrow channels w<lambda and wide films w>lambda. A wide transitional region
where the condition w>lambda holds with a large margin and at the same time
cannot be explained from the standpoint of the theory of the appearance of a
vortex state has been found. This shows that the generally accepted criterion w
\sim lambda for dividing films into wide and narrow does not work. The
transition into a wide-film regime, described by the existing theory of the
vortex state, is fully completed only for w/lambda(T) > 10-20.

21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex