Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parallel Critical Field in Thin Niobium Films: Comparison to Theory   For the first time, a comparison to the predicted behavior for parallel
critical field is carried out for the model of Kogan and the model of Hara and
Nagai. In this study, thin niobium films in the moderately dirty regime were
considered. Experimental values of the $-C_{2}$ term are seen to be lower than
those from the model of Hara and Nagai. A possible reason for this could be not
including the non spherical Fermi surface of niobium into the model. There is
clearly disagreement with the model of Kogan as the films get cleaner and
thinner, and two films which should be below his critical thickness still show
positive values of $-C_{2}$, in disagreement with his theory.

31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat