Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impurity scattering in superconductors   We present some of the recent theoretical studies on the impurity effects in
conventional superconductors, such as magnetic and ordinary impurity effects in
dirty and weak localization limits, and describe successfully unexplained
experimental results. We find that the critical sheet resistance for the
suppression of superconductivity in thin films depends on superconductor, and
point out that impurity dopings in high T_c superconductors cause a
metal-insulator transition and thereby suppress T_c.

7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math