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Phase Diagram of Metal-Insulator Transition in System with Anderson-Hubbard Centers

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Skorenkyy Y., Didukh L., Kramar O., Dovhopyaty Y.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
532-534
EN
The model of a strongly correlated system in which periodically spaced Anderson-Hubbard centers are introduced into narrow-band metal is considered. Besides the interactions between localized magnetic moments and strong on-site Coulomb interaction, the model takes into account the hybridization of localized and band states. To study the effect of the lattice deformation on the electrical properties of the system, the phonon term and elastic energy have been taken into account. Green functions for band and localized electrons have been found. On this base, the energy spectrum has been investigated as a function of model parameters, temperature and external pressure. The criterion of the metal-insulator transition for an integer value of electron concentration has been derived and the phase diagram of the metal-insulator transition has been built.
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Mott Transition, Ferromagnetism and Conductivity in the Generalized Hubbard Model

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Skorenkyy Y., Didukh L., Kramar O., Dovhopyaty Y.
Acta Physica Polonica A
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2007
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vol. 111
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issue 4
635-644
EN
The electron correlations in narrow energy bands are examined within the framework of the Hubbard model, generalized by taking into account the correlated hopping of electrons. Electronic conductivity and ferromagnetic ordering stabilization in the system with various forms of electronic density of states are studied. The influence of magnetic field, temperature and the form of density of states on concentration dependence of conductivity and magnetization is investigated. The correlated hopping is shown to cause the electron-hole asymmetry of transport and ferromagnetic properties of narrow band materials.
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