Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-01-22
Eur. Phys. J. B 71,37(2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 10 figures
Scientific paper
10.1140/epjb/e2009-00269-1
In this work we discuss the occurrence of ferromagnetism in transition-like metals. The metal is represented by two hybridized($V$) and shifted $(\epsilon_s$) bands one of which includes Hubbard correlation whereas the other is uncorrelated. The starting point is to transform the original Hamiltonian into an effective one. Only one site retains the full correlation (U) while in the others the correlations are represented by an effective field, the self-energy(single-site approximation). This field is self-consistently determined by imposing the translational invariance of the problem. Thereby one gets an exchange split quasi-particle density of states and then an electron-spin polarization for some values of the parameters $(U,V, \alpha, \epsilon_s)$, $\alpha$ being the ratio of the effective masses of the two bands and of the occupation number $n$.
Chaves C. M.
Troper A.
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