Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct observation of intrinsic surface magnetic disorder in amorphous
  superconducting films   The interplay between disorder and interactions can dramatically influence
the physical properties of thin-film superconductors. In the most extreme case,
strong disorder is able to suppress superconductivity as an insulating phase
emerges. Due to the known pair-breaking potential of magnetic disorder on
superconductors, the research focus is on the influence of non-magnetic
disorder. Here we provide direct evidence that magnetic disorder is also
present at the surface of amorphous superconducting films. This magnetic
disorder is present even in the absence of magnetic impurity atoms and is
intimately related to the surface termination itself. While bulk
superconductivity survives in sufficiently thick films, we suggest that
magnetic disorder may crucially affect the superconductor-to-insulator
transition in the thin-film limit.

12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg