Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High current-carrying capability in c-axis-oriented superconducting MgB2
  thin films   In high-quality c-axis-oriented MgB2 thin films, we observed high critical
current densities (Jc) of 16 MA/cm^2 at 15 K under self fields comparable to
those of cuprate high-temperature superconductors. The extrapolated value of Jc
at 5 K was estimated to be 40 MA/cm^2. For a magnetic field of 5 T, a Jc of 0.1
MA/cm^2 was detected at 15 K, suggesting that this compound would be a very
promising candidate for practical applications at high temperature and lower
power consumption. The vortex-glass phase is considered to be a possible
explanation for the observed high current-carrying capability.

7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph