Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic correlation effects and local magnetic moments in L1$_0$
  phase of FeNi   We study the electronic and magnetic properties of L1$_0$ phase of FeNi, a
perspective rare-earth-free permanent magnet, by using a combination of density
functional and dynamical mean-field theory. Although L1$_0$ FeNi has a slightly
tetragonally distorted fcc lattice, we find that magnetic properties of its
constituent Fe atoms resemble those in pure bcc Fe. In particular, our results
indicate the presence of well-localized magnetic moments on Fe sites, which are
formed due to Hund's exchange. At the same time, magnetism of Ni sites is much
more itinerant. Similarly to pure bcc Fe, the self-energy of Fe $3d$ states is
found to show the non-Fermi-liquid behavior. This can be explained by
peculiarities of density of Fe $3d$ states, which has pronounced peaks near the
Fermi level. Our study of local spin correlation function and momentum
dependence of particle-hole bubble suggests that the magnetic exchange in this
substance is expected to be of RKKY-type, with iron states providing
local-moment contribution, and the states corresponding to nickel sites
(including virtual hopping to iron sites) providing itinerant contribution.

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The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph