Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in Metal-mixed Ion-Implanted Polymer Films   Ion-implantation of normally insulating polymers offers an alternative to
depositing conjugated organics onto plastic films to make electronic circuits.
We used a 50 keV nitrogen ion beam to mix a thin 10 nm Sn/Sb alloy film into
the sub-surface of polyetheretherketone (PEEK) and report the low temperature
properties of this material. We observed metallic behavior, and the onset of
superconductivity below 3 K. There are strong indications that the
superconductivity does not result from a residual thin-film of alloy, but
instead from a network of alloy grains coupled via a weakly conducting,
ion-beam carbonized polymer matrix.

28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph