Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of Interfaces on the Transport Properties of Graphite revealed
  by Nanometer Thickness Reduction   We investigated the influence of thickness reduction on the transport
properties of graphite microflakes. Using oxygen plasma etching we decreased
the thickness of highly oriented pyrolytic graphite (HOPG) microflakes from
$\sim 100$~nm to $\sim 20$~nm systematically. Keeping current and voltage
electrodes intact, the electrical resistance $R(T)$, the magnetoresistance (MR)
and Raman spectra were measured in every individual sample and after each
etching step of a few nm. The results show that $R(T)$ and MR can increase or
decrease with the sample thickness in a non-systematic way. The results
indicate that HOPG samples are inhomogeneous materials, in agreement with
scanning transmission electron microscopy images and X-ray diffraction data.
Our results further indicate that the quantum oscillations in the MR are not an
intrinsic property of the ideal graphite structure but their origin is related
to internal conducting interfaces.

16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th