Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A theoretical investigation of the specific heat of superlattices in a
  magnetic field   We analyze the specific heat variations as a function of an external magnetic
field of a simple model of superlattice that includes (i) in--plane
ferromagnetic exchange, (ii) interplane ferromagnetic exchange, (iii) dipolar
interactions, (iv) magnetocristalline anisotropy. The calculations are carried
out at the spin wave level. The interplay between the existence of a canting
transition and the anisotropy of the structure generates non trivial behavior
for the spin wave contribution to the low temperature specific heat as a
function of an external magnetic field when dipolar interactions and
magnetocristalline anisotropy are taken into account.

32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin