Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dendritic flux avalanches in Niobium single crystal near critical
  temperature   We report on the observation of dendritic flux avalanches in a large Niobium
single crystal. In contrast to avalanches observed in thin films, they appear
only in a very narrow temperature interval of about a tenth of a Kelvin near
the critical temperature of Nb. At a fixed temperature, we find two sets of
dendritic structures, which differ by the magnetic field required for their
formation and by the maximum distance the dendrites penetrate into the sample.
The effect is caused by dendritic flux penetration into thin superconducting
surface layers formed in the single crystal close to the critical temperature.

12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph