Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Off-axis electron holography and microstructure of Ba0.5Sr0.5TiO3 thin
  film grown on LaAlO3   Epitaxial Ba0.5Sr0.5TiO3 thin films grown on the (001) LaAlO3 substrates with
the ferroelectric transition of about 250K have been investigated by TEM and
off-axis electron holography. Cross-sectional TEM observations show that the
350nm-thick Ba0.5Sr0.5TiO3 film has a sharp interface with notable misfit
dislocations. Off-axis electron holographic measurements reveal that, at low
temperatures, the ferroelectric polarization results in systematic
accumulations of negative charges on the interface and positive charges on the
film surface, and, at room temperature, certain charges could only accumulate
at the interfacial dislocations and other defective areas.

30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin