Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Compton profiles of disordered Fe$_{0.5}$Ni$_{0.5}$ and ordered
  FeNi alloys   We study the magnetic Compton profile (MCP) of the disordered
Fe$_{0.5}$Ni$_{0.5}$ and of the ordered FeNi alloys and discuss the interplay
between structural disorder and electronic correlations. The Coherent Potential
Approximation is employed to model the substitutional disorder within the
single-site approximation, while local electronic correlations are captured
with the Dynamical Mean Field Theory. Comparison with the experimental data
reveals the limitation of local spin-density approximation in low momentum
region, where we show that including local but dynamic correlations the
experimental spectra is excellently described. We further show that using local
spin-density approximation no significant difference is seen between the MCP
spectra of the disordered Fe$_{0.5}$Ni$_{0.5}$ and a hypothetical, ordered FeNi
alloy with a simple cubic unit cell. Only by including the electronic
correlations, the spectra significantly separate, from the second Brillouin
zone boundary down to zero momenta. The difference between the MCP spectra of
ordered and disordered alloys is discussed also in terms of the atomic-type
decompositions. Finally based on the presented calculations we predict the
shape of the MCP profile for the ordered FeNi alloy along the [111] direction.

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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
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The categories of this paper are: stat
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph