Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of the Ni sites across the pressure-induced metallization in
  YNiO3   The local environment of nickel atoms in Y NiO3 across the pressure- induced
insulator to metal (IM) transition was studied using X-ray absorption
spectroscopy (XAS) supported by ab initio calculations. The monotonic
contraction of the NiO6 units under applied pressure observed up to 13 GPa,
stops in a limited pressure domain around 14 GPa, before resuming above 16 GPa.
In this narrow pressure range, crystallographic modifications basically occur
in the medium/long range, not in the NiO6 octahedron, whereas the evolution of
the near-edge XAS features can be associated to metallization. Ab initio
calculations show that these features are related to medium range order,
provided that the Ni-O-Ni angle enables a proper overlap of the Ni eg and O 2p
orbitals. Metallization is then not directly related to modifications in the
average local geometry of the NiO6 units but more likely to an inter-octahedra
rearrangement. These outcomes provides evidences of the bandwidth driven nature
of the IM transition.

7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg