Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doping driven magnetic instabilities and quantum criticality of
  NbFe$_{2}$   Using density functional theory we investigate the evolution of the magnetic
ground state of NbFe$_{2}$ due to doping by Nb-excess and Fe-excess. We find
that non-rigid-band effects, due to the contribution of Fe-\textit{d} states to
the density of states at the Fermi level are crucial to the evolution of the
magnetic phase diagram. Furthermore, the influence of disorder is important to
the development of ferromagnetism upon Nb doping. These findings give a
framework in which to understand the evolution of the magnetic ground state in
the temperature-doping phase diagram. We investigate the magnetic instabilities
in NbFe$_{2}$. We find that explicit calculation of the Lindhard function,
$\chi_{0}(\mathbf{q})$, indicates that the primary instability is to finite
$\mathbf{q}$ antiferromagnetism driven by Fermi surface nesting. Total energy
calculations indicate that $\mathbf{q}=0$ antiferromagnetism is the ground
state. We discuss the influence of competing $\mathbf{q}=0$ and finite
$\mathbf{q}$ instabilities on the presence of the non-Fermi liquid behavior in
this material.

32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph