Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting transition temperature of Pb nanofilms: Impact of the
  thickness-dependent oscillations of the phonon mediated electron-electron
  coupling   To date, several experimental groups reported measurements of the thickness
dependence of T_c of atomically uniform single-crystalline Pb nanofilms. The
reported amplitude of the T_c-oscillations varies significantly from one
experiment to another. Here we propose that the reason for this unresolved
issue is an interplay of the quantum-size variations in the single-electron
density of states with thickness-dependent oscillations in the phonon mediated
electron-electron coupling. Such oscillations in the coupling depend on the
substrate material, the quality of the interface, the protection cover and
other details of the fabrication process, changing from one experiment to
another. This explains why the available data do not exhibit one-voice
consistency about the amplitude of the T_c-oscillations. Our analyses are based
on a numerical solution of the Bogoliubov-de Gennes equations for a
superconducting slab.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg