Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Upper Critical Field for Unconventional Superconducting Film: a Kink
  due to the Boundary Conditions   Boundary conditions for unconventional superconducting order parameter are
obtained on the basis of a microscopic theory. The upper critical field in a
superconducting film is examined for unconventional superconductors with
two-component order parameter and is compared with the case of accidental
degeneracy. It is shown, that for both cases temperature dependences of the
upper critical field in a superconducting film may depend substantially on the
quality of boundaries, and under certain conditions have a kink due to the
influence of film boundaries. The location of a kink point appears to be
dependent on a film thickness. If for a massive sample there is another reason
for the existance of a kink, the interplay of the reasons may lead to a
specific behaviour of a kink point location as a function of a temperature or a
film thickness. A new test is suggested permitting to distinguish between
$E_{1}$ and $E_{2}$ types of pairing in a hexagonal superconductor near $T_c$.

23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph