Noncollinear cluster magnetism in the framework of the Hubbard model

Details Noncollinear cluster magnetism in the framework of the Hubbard model Noncollinear cluster magnetism in the framework of the Hubbard model

1999-03-19

arxiv.org/abs/cond-mat/9903296v2

Physics

Condensed Matter

Strongly Correlated Electrons

Latex, two-colums 13 pages, 9 figures

Scientific paper

10.1103/PhysRevB.60.6121

Noncollinear magnetic states in clusters are studied by using the single-band Hubbard Hamiltonian. The unrestricted Hartree-Fock (UHF) approximation is considered without imposing any symmetry constraints neither to the size or orientation of the local magnetic moments $<\vec S_l>$ nor to the local charge densities $$. A variety of qualitatively different selfconsistent solutions is obtained as a function of cluster size, structure, number of valence electrons $\nu$ and Coulomb interaction strength $U/t$. This includes inhomogeneous density distributions, paramagnetic solutions, magnetic solutions with collinear moments and noncollinear spin arrangements that show complex antiferromagnetic and ferromagnetic-like orders. The environment dependence of the magnetic properties is analyzed giving emphasis to the effects of antiferromagnetic frustrations in compact structures close to half-band filling. Electron correlation effects are quantified by comparing UHF and exact results for the local magnetic moments, total spin, spin-correlation functions and structural stability of 13-atom clusters. Goals and limitations of the present noncollinear approach are discussed.

Affiliated with

Also associated with

No associations

Rating

Noncollinear cluster magnetism in the framework of the Hubbard model 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 Noncollinear cluster magnetism in the framework of the Hubbard model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noncollinear cluster magnetism in the framework of the Hubbard model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-207153