Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-temperature thermodynamics of one-dimensional alternating-spin
  Heisenberg ferromagnets   Motivated by a novel bimetallic chain compound in which alternating magnetic
centers are ferromagnetically coupled, we investigate thermodynamic properties
of one-dimensional spin-$(S,s)$ Heisenberg ferromagnets both numerically and
analytically. On the one hand, quantum Monte Carlo calculations illuminate the
overall thermal behavior. The specific heat may exhibit a double-peaked
structure at intermediate temperatures for $S\agt 3s$ in general. On the other
hand, a modified spin-wave theory precisely describes the low-temperature
properties. Expanding the specific heat and the magnetic susceptibility, we
reveal an analogy and a contrast between mixed-spin ferromagnets and
ferrimagnets.

16
The categories of this paper are: stat
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math