ISSN:
1434-6079
Keywords:
PACS. 36.40.Cg Electronic and magnetic properties of clusters - 71.24.+q Electronic structure of clusters and nanoparticles - 75.10.Lp Band and itinerant models
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: The electronic and magnetic properties of clusters are investigated in the framework of the Hubbard model by treating electron correlations effects in a saddle-point slave-boson approximation. The size dependent single-particle spectrum is calculated using a third moment real-space expansion of the local density of states. Results for the magnetic moments, magnetic order, average number of double occupations and hopping renormalizations are given as a function of the local coordination number z, for different representative values of the Coulomb interaction strength U/t and band filling n. Several transitions between paramagnetic, ferromagnetic and antiferromagnetic behaviors are obtained as a function of z. The environment dependence of the magnetic behavior and of the degree of electron delocalization is analyzed. Advantages and limitations of the present approach are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100530050233
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