Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical properties of (Pr,Ce)2CuO4   We studied the optical conductivity of electron doped Pr{1-x)Ce(x)CuO(4) from
the underdoped to the overdoped regime. The observation of low to high
frequency spectral weight transfer reveals the presence of a gap, except in the
overdoped regime. A Drude peak at all temperatures shows the partial nature of
this gap. The close proximity of the doping at which the gap vanishes to the
antiferromagnetic phase boundary leads us to assign this partial gap to a spin
density wave.

5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
19
The categories of this paper are: eess
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph