Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Softer than normal, but not as soft as one might think: Spontaneous flux
  lattices in ferromagnetic spin-triplet superconductors   A theory is developed for the spontaneous vortex lattice that is expected to
occur in the ferromagnetic superconductors ZrZn_2, UGe_2, and URhGe, where the
superconductivity is likely of spin-triplet nature. The long-wavelength
fluctuations of this spontaneous flux lattice are predicted to be huge compared
to those of a conventional flux lattice, and to be the same as those for
spin-singlet ferromagnetic superconductors. It is shown that these fluctuations
lead to unambiguous experimental signatures which may provide the easiest way
to observe the spontaneous flux lattice.

2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph