Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crossing lattices, vortex chains, and angular dependence of melting line
  in layered superconductors   We investigate vortex structure and melting transition in very anisotropic
layered superconductors at fields tilted with respect to the c-axis. We show
that even a small in-plane field does not homogeneously tilt the vortex lattice
but, instead, penetrates inside the superconductor in the form of Josephson
vortices (JVs) similar to the Meissner state. At high c-axis magnetic field the
phase field of the JV is built up from the phase perturbations created by
displacements of pancake vortices. The crossing-lattices ground state leads to
linear dependencies of the melting field and melting temperature on the
in-plane field, in agreement with recent experimental observations. At small
fields stacks of JVs accumulate additional pancake strings creating vortex rows
with enhanced density. This mechanism explains the mixed chains-lattice state
observed by Bitter decorations.

7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs