Low-temperature ferromagnetism in a weakly doped Hubbard magnet

Details Low-temperature ferromagnetism in a weakly doped Hubbard magnet Low-temperature ferromagnetism in a weakly doped Hubbard magnet

2010-06-04

arxiv.org/abs/1006.0907v1

Ukrainian Journal of Physics, 2009, Vol. 54, no. 1-2, pp. 207-215

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures; http://www.ujp.bitp.kiev.ua

Scientific paper

In the framework of the diagrammatic method with self-consistent field, the maximum on the temperature dependence of the susceptibility of a weakly doped narrow-band Hubbard magnet below the Curie temperature $T_{\rm C}$ is predicted. By numerical calculations, it is proved that it appears at small hole concentrations $n_{h}$. In this case, the temperature dependence of the magnetization $M$($T$) has a typical Fermi-like shape with the point of inflection at a temperature $T_{\rm inf}$. The approximate solution of the system of equations for the mean spin and the chemical potential gives the Schottky susceptibility typical of a two-level system with a gap of order of $n_{h}(1-n_{h})W$, where W is the bandwidth. This behavior reflects the existence of two subbands with up- and down-spins. It may be observed experimentally in the surface layers of oxide metal nanoparticles with narrow bands and a weak oxygen nonstoichiometry.

Affiliated with

Also associated with

No associations

Rating

Low-temperature ferromagnetism in a weakly doped Hubbard magnet 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 Low-temperature ferromagnetism in a weakly doped Hubbard magnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-temperature ferromagnetism in a weakly doped Hubbard magnet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-723026