Kondo interaction and strongly correlated electrons
P. B. Zubin, V. A. Ivanov, E. A. Ugolkova
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences
A study is made of a system of strongly correlated electrons that are localized on a lattice and coupled to the free electrons by the 4-fermion interaction proposed by Kondo. A realistic Hamiltonian is constructed in the basis of atomic operators of the superalgebra spl(8;8). A scheme is proposed for calculating the spectrum of Fermi excitations with respect to a small parameter, which is the hopping integral made dimensionless by intraatomic correlations. The static spin susceptibility is calculated as a function of the temperature and concentration of the electrons and is found to be in agreement with the experimental susceptibility for several narrow-band organometallic compounds. The nonphonon kinematic mechanism is used to estimate the possibility of superconducting pairing in the proposed model, and $T_c$ and the corresponding critical electron concentration in one of the correlated bands are calculated.
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Theoretical and Mathematical Physics, 1994, 101:2, 1368–1375
P. B. Zubin, V. A. Ivanov, E. A. Ugolkova, “Kondo interaction and strongly correlated electrons”, TMF, 101:2 (1994), 304–314; Theoret. and Math. Phys., 101:2 (1994), 1368–1375
Citation in format AMSBIB
\by P.~B.~Zubin, V.~A.~Ivanov, E.~A.~Ugolkova
\paper Kondo interaction and strongly correlated electrons
\jour Theoret. and Math. Phys.
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