Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron Diffraction Study of the Irreversible R-MA-MC Phase Transition
  in Single Crystal Pb[(Zn1/3Nb2/3)1-xTix]O3   Single crystals of the relaxor PZN-xPT display an enormously strong
piezoelectric character. Recent x-ray scattering studies have revealed novel
electric-field induced phase transitions in PZN-8%PT. As-grown crystals exhibit
a rhombohedral structure that, under application of an electric field oriented
along [001], transforms into a monoclinic (MA) phase, and then irreversibly to
another monoclinic (MC) phase with increasing field strength. Since the latter
phase change is very unusual, its transition sequence has been investigated by
using triple-axis neutron scattering techniques so that the ``skin effect''
observed by x-ray scattering can be avoided, and the entire crystal bulk is
probed. Contour maps of the elastic scattering have been mapped out in each
phase in the (HOL) zone with high q-resolution. Increasing the field strength
within the MC phase induces a sharp c-axis jump around 15 kV/cm. This jump was
observed easily with x-rays in previous studies, but it was not observed in 5
different crystals examined with neutrons. A subsequent high-energy x-ray study
of the same crystals showed that the c-axis jump is distributed within the
crystal volume, thereby washing out the jump. The observed R-MA-MC
transformational path is in perfect accord with very recent first principles
calculations by Bellaiche, Garcia, and Vanderbilt in the PZT system.

5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio