Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic annealing process and its impact on superconductivity in
  T'-structure electron-doped copper oxides   High-transition-temperature superconductivity arises in copper oxides when
holes or electrons are doped into the CuO2 planes of their insulating parent
compounds. While hole-doping quickly induces metallic behavior and
superconductivity in many cuprates, electron-doping alone is insufficient in
materials such as R2CuO4 (R is Nd, Pr, La, Ce, etc.), where it is necessary to
anneal an as-grown sample in a low-oxygen environment to remove a tiny amount
of oxygen in order to induce superconductivity. Here we show that the
microscopic process of oxygen reduction repairs Cu deficiencies in the as-grown
materials and creates oxygen vacancies in the stoichiometric CuO2 planes,
effectively reducing disorder and providing itinerant carriers for
superconductivity. The resolution of this long-standing materials issue
suggests that the fundamental mechanism for superconductivity is the same for
electron- and hole-doped copper oxides.

1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci