Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single crystal studies and electronic structure investigation of a
  room-temperature semiconductor NaMnAs   We report synthesis of single crystalline NaMnAs, confirm its
antiferromagnetic order and characterise the sample by photoemission
spectroscopy. The electronic structure was studied using optical transmittance,
x-ray and ultraviolet spectroscopy and by theoretical modeling using local
density approximation (LDA) extended to LDA+U when Heisenberg model parameters
were determined. Optical transmittance measurement have confirmed the
theoretical predictions that NaMnAs is a semiconductor. Also the N\'eel
temperature was closer determined for the first time from temperature
dependence of magnetization, in agreement with our Monte Carlo simulations.

28
The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci