Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prediction of a Heusler alloy with switchable metal-to-half-metal
  behavior   We propose a ferromagnetic Heusler alloy that can switch between a metal and
a half-metal. Thiseffect can provide tunable spintronics properties. Using the
density functional theory (DFT) withreliable implementations of the electron
correlation effects, we find Mn2ScSi total energy curvesconsisting of distinct
branches with a very small energy difference. The phase at low lattice
crystalvolume is a low magnetic half-metallic state while the phase at high
lattice crystal volume is a highmagnetic metallic state. We suggest that the
transition between half-metallic and metallic statescan be triggered by a
triaxial contraction/expansion of the crystal lattice or by an external
magneticfield if we assume that the lattice is cubic and remains cubic under
expansion/contraction. However,the phase at high volume can also undergo an
austenite-martensite phase transition because of thepresence of Jahn-Teller
active3delectrons on the Mn atoms.

13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg