Mesoscopic Stoner Instability

Details Mesoscopic Stoner Instability Mesoscopic Stoner Instability

2000-04-12

arxiv.org/abs/cond-mat/0004205v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, 6 figures

Scientific paper

The paper is devoted to the magnetic properties of isolated mesoscopic grains. We demonstrate that under very general conditions the electron - electron interactions in such grains can be taken into account by a simple interaction Hamiltonian. This Hamiltonian involves only three coupling constants which correspond to charging, exchange interaction, and superconducting correlations. The most important condition for such a description is that Thouless conductance of each grain is large. Under this condition sample-to-sample fluctuations of the coupling constants can be neglected. However, the thermodynamic properties can still remain sample-specific due to the one-electron part of the Hamiltonian. If the grain is made from a material which is close to the threshold of ferromagnetic instability the mesoscopic fluctuations of the magnetization are especially strong. Moreover, the situation becomes multi-stable: free energy of each grain as a function of the magnetization is characterized by a large number of local minima. We analyze the statistics of these minima and show that it possesses simple scaling properties. Numerical simulations confirm this scaling.

Affiliated with

Also associated with

No associations

Rating

Mesoscopic Stoner Instability 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 Mesoscopic Stoner Instability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mesoscopic Stoner Instability will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-201840