Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-principles study on the magnetic properties of six potential
  half-metallic ferromagnets: alkaline-earth (Ca, Sr) doped XC (X=Si, Ge, Sn)   Six half-metallic ferromagnets X0.75Y0.25C (X=Si, Ge, Sn and Y =Ca and Sr)
with zinc-blende structure, resulting from alkaline-earth (Ca, Sr) substitution
for X, are predicted based on the density functional theory. The calculated
total magnetic moments of these ferromagnets are all integer 2.00{\mu}B per
supercell, which are one of important characters of half-metallic ferromagnets.
Our calculations indicate that X0.75Y0.25C have wide spin gap and potentially
have high Curie temperature. Alkaline-earth doping results in the
spin-polarization and half-metallicity of these compounds. It is confirmed that
the p-d exchange coupling is responsible for the ferromagnetism of X0.75Y0.25C
except Sn0.75Ca0.25C.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ