Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Insight into perovskite antiferroelectric phases: Landau theory and
  phase field study   Understanding the appearance of commensurate and incommensurate modulations
in perovskite antiferroelectrics (AFEs) is of great importance for material
design and engineering. The dielectric and elastic properties of the AFE domain
boundaries are lack of investigation. In this work, a novel Landau theory is
proposed to understand the transformation of AFE commensurate and
incommensurate phases, by considering the coupling between the oxygen
octahedral tilt mode and the polar mode. The derived relationship between the
modulation periodicity and temperature is in good agreement with the
experimental results. Using the phase field study, we show that the
polarization is suppressed at the AFE domain boundaries, contributing to a
remnant polarization and local elastic stress field in AFE incommensurate
phases.

9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con