Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rigorous determination of the ground-state phases and thermodynamics in
  an Ising-type multiferroic Ca3CoMnO6 chain   To understand the collinear-magnetism-driven ferroelectricity in multiferroic
Ca3CoMnO6 compound, we have established an elastic diatomic Ising spin-chain
model with axial-next-nearest-neighbor interaction to describe its
magnetoelectric properties. By employing magneto-phonon decoupling and
transfer-matrix method, the possible ground-state configurations and
thermodynamic behaviors of the system have been exactly determined. From the
perspective of the ground-state configuration, we analyze the computational
results and make a detail comparison with experimental data. The parameter
relation for the appearance of electric polarization has been discussed. Our
data indicate that the magnetic coupling between nearest-neighbor spin pair is
antiferromagnetic rather than ferromagnetic. The system under the driven of
external magnetic field undergoes a different series of transitions from the
up-up-down-down spin configuration to the up-down-up state with peculiar 1/3
magnetization plateau, then to the up-up-up-down state, and finally saturated
at up-up-up-up state.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
18
The categories of this paper are: econ
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin