Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lamellar mesophase nucleated by Josephson vortices at the melting of the
  vortex lattice in $Bi_2Sr_2CaCu_2O_{8+delta}$   The local effect of the Josephson vortices on the vortex lattice melting
process in \BSCCO crystals in the presence of an in-plane field $H_{ab}$ is
studied by differential magneto-optical imaging. The melting process is found
to commence along the Josephson vortex stacks, forming a mesomorphic phase of
periodic liquid and solid lamellas, the direction and spacing of which are
controlled by $H_{ab}$. The reduction of the local melting field $H_m$ along
the Josephson vortex stacks is more than an order of magnitude larger than the
reduction of the average bulk $H_m$ by $H_{ab}$.

27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph