Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Closing the superconducting gap in small Pb-nanoislands with high
  magnetic fields   Superconducting properties change in confined geometries. Here we study the
effects of strong confinement in nanosized Pb-islands on Si(111) 7x7. Small
hexagonal islands with diameters less than 50 nm and a uniform height of 7
atomic layers are formed by depositing Pb at low temperature and annealing at
300 K. We measure the tunneling spectra of individual Pb-nanoislands using a
low-temperature scanning tunneling microscope operated at 0.6 K, and follow the
narrowing of the superconducting gap as a function of magnetic field. We find
the critical magnetic field, at which the superconducting gap vanishes, reaches
several Tesla, which represents a greater than 50-fold enhancement compared to
the bulk value. By independently measuring the size of the superconducting gap,
and the critical magnetic field that quenches superconductivity for a range of
nanoislands we can correlate these two fundamental parameters and estimate the
maximal achievable critical field for 7 ML Pb-nanoislands to 7 T.

22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th