Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CaBaCo$_4$O$_7$ : A ferrimagnetic pyroelectric   Magneto-electric coupling in pyroelectric CaBaCo$_4$O$_7$ is investigated
using ab-intio calculations and Landau theory. The former shows that
exchange-striction is strong enough to produce a giant change in electric
polarization upon ferrimagnetic ordering, comparable to the experimentally
determined value of ~17 mC/m$^2$ . Furthermore, Landau theory demonstrates that
magneto-elastic coupling in CaBaCo$_4$O$_7$ is responsible for the strong
magneto-electric coupling appearing close to the magnetic phase transition.

1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio