Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic behaviour of SO(5) superconductors   The distinction between type I and type II superconductivity is re-examined
in the context of the SO(5) model recently put forth by Zhang. Whereas in
conventional superconductivity only one parameter (the Ginzburg-Landau
parameter $\kappa$) characterizes the model, in the SO(5) model there are two
essential parameters. These can be chosen to be $\kappa$ and another parameter,
$\beta$, related to the doping. There is a more complicated relation between
$\kappa$ and the behaviour of a superconductor in a magnetic field. In
particular, one can find type I superconductivity even when $\kappa$ is large,
for appropriate values of $\beta$.

11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ