A dynamical mean-field theory study of Nagaoka ferromagnetism

Details A dynamical mean-field theory study of Nagaoka ferromagnetism A dynamical mean-field theory study of Nagaoka ferromagnetism

2007-08-30

arxiv.org/abs/0708.4240v2

Phys. Rev. B 77, 035107 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 11 figures

Scientific paper

10.1103/PhysRevB.77.035107

We revisit Nagaoka ferromagnetism in the U=oo Hubbard model within the dynamical mean-field theory (DMFT) using the recently developed continuous time quantum Monte Carlo method as the impurity solver. The stability of Nagaoka ferromagnetism is studied as a function of the temperature, the doping level, and the next-nearest-neighbor lattice hopping t'. We found that the nature of the phase transition as well as the stability of the ferromagnetic state is very sensitive to the t' hopping. Negative t'=-0.1t stabilizes ferromagnetism up to higher doping levels. The paramagnetic state is reached through a first order phase transition. Alternatively, a second order phase transition is observed at t'=0. Very near half-filling, the coherence temperature T_{coh} of the paramagnetic metal becomes very low and ferromagnetism evolves out of an incoherent metal rather than conventional Fermi liquid. We use the DMFT results to benchmark slave-boson method which might be useful in more complicated geometries.

Affiliated with

Also associated with

No associations

Rating

A dynamical mean-field theory study of Nagaoka ferromagnetism 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 A dynamical mean-field theory study of Nagaoka ferromagnetism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A dynamical mean-field theory study of Nagaoka ferromagnetism will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-617580