Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral signatures of thermal spin disorder and excess Mn in
  half-metallic NiMnSb   Effects of thermal spin disorder and excess Mn on the electronic spectrum of
half-metallic NiMnSb are studied using first-principles calculations.
Temperature-dependent spin disorder, introduced within the vector disordered
local moment model, causes the valence band at the $\Gamma$ point to broaden
and shift upwards, crossing the Fermi level and thereby closing the
half-metallic gap above room temperature. The spectroscopic signatures of
excess Mn on the Ni, Sb, and empty sites (Mn$_\mathrm{Ni}$, Mn$_\mathrm{Sb}$,
and Mn$_\mathrm{E}$) are analyzed. Mn$_\mathrm{Ni}$ is spectroscopically
invisible. The relatively weak coupling of Mn$_\mathrm{Sb}$ and Mn$_\mathrm{E}$
spins to the host strongly deviates from the Heisenberg model, and the spin of
Mn$_\mathrm{E}$ is canted in the ground state. While the half-metallic gap is
preserved in the collinear ground state of Mn$_\mathrm{Sb}$, thermal spin
disorder of the weakly coupled Mn$_\mathrm{Sb}$ spins destroys it at low
temperatures. This property of Mn$_\mathrm{Sb}$ may be the source of the
observed low-temperature transport anomalies.

31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
19
The categories of this paper are: eess
18
The categories of this paper are: econ
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin