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Information × Registration Number 0206U004269, 0103U003516 , R & D reports Title Electron correlations in narrow energy bands: magnetism and thermic-magnetic-electrical properties popup.stage_title Head Didukh Leonid Dmytrovych, Registration Date 16-02-2006 Organization Ternopil Ivan Pul'uj State Technical University popup.description2 Effective hamiltonians of the non-degenerate band with correlated hopping and exchange interaction and double orbitally degenerate band (for the transition metal disulphides) for the description of electric and magnetic properties of materials with strong electron correlations have been formulated. The expressions for ground-state energy, paramagnet-ferromagnet transition criteria, the magnetization depndence on model parameters have been obtained. The expressions for the Curie temperature and the magnetic susceptibility have been found. For the narrow-band antiferromagnet the transition criteria and Neel temperature have been calculated. New theoretical approaches for the investigations of conductance of narrow-band materials have been formulated; the influence of temperature, pressure, carriere concentration and magnetic field on the conductivity have been studied, the effective mass and conductivity in the non-degenerate and orbitally degenerate models have been calculated; on the base of the formulated theory the experimental data for transition metal compounds have been explained and new narrow-band effects have been predicted. Product Description popup.authors popup.nrat_date 2020-04-02 Close