Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of oxygen pressure and aging on LaAlO3 films grown by pulsed
  laser deposition on SrTiO3 substrates   The crystal structures of LaAlO3 films grown by pulsed laser deposition on
SrTiO3 substrates at oxygen pressure of 10-3 mbar or 10-5 mbar, where kinetics
of ablated species hardly depend on oxygen background pressure, are compared.
Our results show that the interface between LaAlO3 and SrTiO3 is sharper when
the oxygen pressure is lower. Over time, the formation of various crystalline
phases is observed while the crystalline thickness of the LaAlO3 layer remains
unchanged. X-ray scattering as well as atomic force microscopy measurements
indicate three-dimensional growth of such phases, which appear to be fed from
an amorphous capping layer present in as-grown samples.

14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat