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Information × Registration Number 0205U007027, 0101U007172 , R & D reports Title Ionic and electonic transport in the ionic conductors and narrow-band electronic materials popup.stage_title Head Stasyuk Ihor Vasylyovych, Registration Date 08-12-2005 Organization Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine popup.description2 Complex investigation of electronic Raman scattering in strongly correlated materials have been performed to show that the resonant effect influence Raman spectra profile considerably. The possibility of transition to charge ordered and superconducting phases for the strongly correlated crystals with local unharmonicity in frames of pseudospin-electron model (PEM) with tunneling splitting of the levels have been analyzed. Analytical approach for calculation of one-particle Green's functions in frames of dynamical mean field theory for asymmetrical Hubbard model have been developed; the localized particle spectra for the Falicov-Kimball model in the limit of infinite repulsion U have been obtained for different concentrations of particles. The possibility of ferromagnetism in PEM in alloy analogy approximation has been shown. The methods that allow one to take into account short-range interactions in the systems with proton (ionic) conductivity have been proposed. The energy spectrum of the one-dimensional proton conductor has been obtained. Depending on the average concentration of protons the system can be in either metallic or dielectric state. The possibility of separation into the regions with different proton concentration has been shown. Dielectric properties of the order-disorder systems with complex structure of hydrogen bonds have been investigated in frames of the microscopic model for proton ordering on the bonds. The model has been applied to the glycine phosphite crystal (GPI). PEM with correlated proton-electron charge transfer in quasi one dimensional structures that include the chains of hydrogen bonds have been proposed. The energy spectrum of the model has been obtained. The phase diagram of the ground state has been built. The real part of the dynamical conductivity has been obtained. Product Description popup.authors popup.nrat_date 2020-04-02 Close