Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of true diluted ferromagnetism above room temperature in
  semiconducting perovskite-type materials   Since 2000, the intensive effort in materials research to develop a diluted
magnetic semiconductor exhibiting high-temperature (HT) ferromagnetism above
room temperature was not successful. Here, the first bulk diluted
HT-ferromagnetic non-metallic materials, based on the perovskite-type
oxynitrides LaTa1-xCox(O,N)3-d (x = 0.01, 0.03, 0.05) are realised. The Curie
temperature of the synthesised powders exceeds 600 K and the sample
magnetisations are large enough to be directly attracted by permanent magnets.
Cobalt clusters as a possible source for the observed HT-ferromagnetism can be
excluded, since all applied characterisation methods verify phase purity.
Applied conventional and element-specific magnetometry imply ferromagnetic
intermediate spin (IS) Co3+ which is included in a ferromagnetic host matrix.
This indicates a complex magnetic interplay between the existing crystal
structure, the observed anionic vacancies, and the introduced cobalt ions.
These results lay the foundation for the experimental investigation and design
of further diluted HT-ferromagnetic semiconductors.

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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat