Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity, incoherence and Anderson localization in the
  crystalline organic conductor (BEDT-TTF)_3Cl_2.2H_2O at high pressures   The conducting properties of the pressure-induced, layered organic
superconductor (BEDT-TTF)_3Cl_2.2H_20 have been studied at 13.5 and 14.0 kbar
using low temperatures, high magnetic fields and two-axis rotation. An upper
critical field that is significantly larger than that expected from the Pauli
paramagnetic limit is observed when the field is applied parallel to the
conducting layers. The angle dependent magnetoresistance suggests incoherent
transport between the conducting layers at both pressures and the observed
negative magnetoresistance at 13.5 kbar can be explained by considering
Anderson localization within the layers. Further application of pressure
destroys the effects of localization.

27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex