Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface superconducting states in yttrium hexaboride single crystal in a
  tilted magnetic field   We present the results of an experimental study of the nucleation of
superconductivity at the surface of a single crystal YB$_6$ in a tilted dc
magnetic field. A recently developed experimental technique allowed us to
determine $H_{c3}$ at each side of the sample as a function of the angle
between the dc magnetic field and the surface. Experiment shows that the ratio
$H_{c3}/ H_{c2}\approx 1.28 $ in the direction perpendicular to the surface dc
field while according to the theory this ratio should be equal to 1. This sharp
distinction cannot be ascribed to the surface roughness.

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The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga