Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The granularity effect in amorphous InGaZnO$_4$ films prepared by rf
  sputtering method   We systematically investigated the temperature behaviors of the electrical
conductivity and Hall coefficient of two series of amorphous indium gallium
zinc oxides (a-IGZO) films prepared by rf sputtering method. The two series of
films are $\sim$700\,nm and $\sim$25\,nm thick, respectively. For each film,
the conductivity increases with decreasing temperature from 300\,K to $T_{\rm
max}$, where $T_{\rm max}$ is the temperature at which the conductivity reaches
its maximum. Below $T_{\rm max}$, the conductivity decreases with decreasing
temperature. Both the conductivity and Hall coefficient vary linearly with $\ln
T$ at low temperature regime. The $\ln T$ behaviors of conductivity and Hall
coefficient cannot be explained by the traditional electron-electron
interaction theory, but can be quantitatively described by the current
electron-electron theory due to the presence of granularity. Combining with the
scanning electron microscopy images of the films, we propose that the
boundaries between the neighboring a-IGZO particles could make the film
inhomogeneous and play an important role in the electron transport processes.

8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
16
The categories of this paper are: stat
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol