Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The structural, elastic, electronic and optical properties of MgCu under
  pressure: A first-principles study   The effect of pressure on the structural, elastic and electronic properties
of the intermetallic compound MgCu with a CsCl-type structure have been
investigated using ab-initio technique. The optical properties have been
studied under normal pressure. We have carried out the plane-wave
pseudopotential approach within the framework of the first-principle density
functional theory (DFT) implemented within the CASTEP code. The calculated
structural parameters show a good agreement with the experimental and other
theoretical results.

35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
2
The categories of this paper are: math