Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-principles predictions of low-energy phases of multiferroic BiFeO3   We used first-principles methods to perform a systematic search for
potentially-stable phases of multiferroic BiFeO3. We considered a simulation
cell compatible with the atomic distortions that are most common among
perovskite oxides, and found a large number of local minima of the energy
within 100 meV/f.u. of the ferroelectric ground state. We discuss the variety
of low-symmetry structures discovered, as well as the implications of these
findings as regards current experimental (e.g., on thin films displaying {\em
super-tetragonal} phases) and theoretical (on models for BiFeO3's structural
phase transitions) work on this compound.

34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol