Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice dynamics and phase stability of rhombohedral antimony under high
  pressure   The high pressure lattice dynamics of rhombohedral antimony have been studied
by a combination of diffuse scattering and inelastic x-ray scattering. The
evolution of the phonon behavior as function of pressure was analyzed by means
of two theoretical approaches: density functional perturbation theory and
symmetry-based phenomenological phase transition analysis. This paper focuses
on the first structural phase transition, SbI-SbIV, and the role of vibrations
in leading the transition. The phonon dispersion exhibits complex behaviour as
one approaches the structural transition, with the branches, corresponding to
the two transitions happening at high pressure in the Va elements (A7-to-BCC
and A7-to-PC) both showing softening.

30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc