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- W2079220587 abstract "We presented the intersite electron-electron correlation into the Hubbard III approximation. This correlation was excluded in the Hubbard III approximation and also in the equivalent coherent-potential approximation. Including it brings two spin-dependent effects: the bandwidth correction and the band shift correction, which both stimulate the ferromagnetic ground state. The band shift correction factor causes an exchange splitting between the spin-up and spin-down spectra, and its role is similar to the exchange interaction in the classic Stoner model. The spin-dependent bandwidth correction lowers the kinetic energy of electrons by decreasing the majority-spin bandwidth for some electron occupations with respect to the minority-spin bandwidth. In certain conditions it can lead to ferromagnetic alignment. A gain in the kinetic energy achieved in this way is the opposite extreme to the effect of a gain in potential energy due to exchange splitting. The band shift factor is a dominant force behind the ferromagnetism, but the presence of both factors working together is necessary to create spontaneous magnetization." @default.
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- W2079220587 date "2009-02-18" @default.
- W2079220587 modified "2023-10-16" @default.
- W2079220587 title "Hubbard model with intersite kinetic correlations" @default.
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- W2079220587 doi "https://doi.org/10.1103/physrevb.79.064414" @default.
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