Topological States in Strongly Correlated Systems

Journal of Superconductivity and Novel Magnetism - Topological order in strongly correlated systems, including quantum spin liquids, quantum Hall states in lattices and topological...     

S. Vonsovsky and the Dawn of the Theory of Strongly Correlated Systems

Journal of Superconductivity and Novel Magnetism - A survey of scientific and social activity of S. V. Vonsovsky is presented. His fundamental works on the theory of electronic properties and...     

Evolution of the spectrum and the metal-insulator transition in local approximations for many-electron models

In terms of the Shubin-Vonsovskii many-electron s-d exchange model and Hubbard model, self-consistent equations for the one-particle retarded Green??s function are derived in the representation of many-electron Hubbard X operators using the method of decoupling of chains of equations of motion. An analysis is given of the general structure of single-site approximations and of their relation to the coherent-potential approximation (CPA) and the dynamic mean-field theory (DMFT). Using the self-consistent approximations, the evolution of the electron spectrum upon the variation of the bare parameters of the model (coupling constants, charge-carrier concentrations) is investigated in detail. Effects of various factors (Kondo many-electrons scattering, damping-induced smearing, proper dynamics of the subsystem of localized momenta) on the shape of the density of states N(E) with allowance for interaction are discussed. It is shown that the use of the locator representation makes it possible in some cases to avoid nonanalyticities in the approximate expressions for the Green??s functions. This approach permits the reproduction (at certain values of the parameters) of the three-peak structure of the DOS near the metal-insulator transition.     

Thermoelectric properties of rare-earth alloys

The electrical resistivity, thermal conductivity, and thermopower have been measured for a large number of newly synthesized metallic compounds and alloys of simple, transition, and rare-earth elements. The maximum room-temperature values of the thermoelectric figure of merit ZT for the presented systems are about 7%. The temperature dependences of the resistivity and thermoelectric power have been discussed. Particular attention has been given to possible manifestations of the Kondo effect and intermediate valence including those in systems based on silicides and nickelides of cerium.     

The interrelationship of the intensity of free-radical oxidation to the level of serum bilirubin in lesions of the hepatobiliary system]

The level of lipid peroxidation (LPO) products increases in the blood of patients with chronic diseases of the liver and acute cholecystitis with mechanical jaundice. The values normalize after surgery for acute cholecystitis, whereas therapy for chronic diseases of the liver virtually does not correct them. These data demonstrate the relationship between intensity of free-radical oxidation and severity of hepatobiliary process and between plasma content of LPO products and level of serum bilirubin.     

Unusual Kinetic Properties of Usual Heusler Alloys

Journal of Superconductivity and Novel Magnetism - The review considers various groups of Heusler compounds, which can have the properties of a semiconductor, a half-metallic ferromagnet, a spin...