Doping driven magnetic instabilities and quantum criticality of NbFe$_{2}$

Details Doping driven magnetic instabilities and quantum criticality of NbFe$_{2}$ Doping driven magnetic instabilities and quantum criticality of NbFe$_{2}$

2010-10-29

arxiv.org/abs/1010.6199v1

Phys. Rev. B 82, 155137 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.82.155137

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.

Affiliated with

Also associated with

No associations

Rating

Doping driven magnetic instabilities and quantum criticality of NbFe$_{2}$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Doping driven magnetic instabilities and quantum criticality of NbFe$_{2}$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Doping driven magnetic instabilities and quantum criticality of NbFe$_{2}$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-615750