Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature dependence of mobility of conducting polymer polyaniline
  with secondary dopant   The conductivity $\sigma$ and carrier density $n$ of the conducting polymer
polyaniline were investigated by changing the concentration $x$ of a secondary
dopant, meta-cresol. We found that $\sigma$ changes by four orders of magnitude
within the $x$-range of 1-10 %, while $n$, as estimated from the Hall
measurements, shows a weak dependence on $x$ in the region of 2% <$x$< 50%.
These results suggest that $\sigma$ can be enhanced by the change in the
mobility $\mu$. We analyzed the temperature dependence of $\mu$ by not only the
combination of two different types of scattering mechanism, but also by the
polaron hopping model. The experimental data of $\mu(T)$ can be explained well
by the latter model with reasonable fitting parameter values of a small-polaron
binding energy and a longitudinal optical phonon frequency.

33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat