Kondo interaction and strongly correlated electrons
| Autor: | Elena A. Ugolkova, Valery A. Ivanov, P. B. Zubin |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Physics
Superconductivity Free electron model Condensed matter physics Kondo insulator Statistical and Nonlinear Physics Electron symbols.namesake Core electron Pairing symbols Condensed Matter::Strongly Correlated Electrons Hamiltonian (quantum mechanics) Mathematical Physics Dimensionless quantity |
| Zdroj: | Theoretical and Mathematical Physics. 101:1368-1375 |
| ISSN: | 1573-9333 0040-5779 |
| Popis: | 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, andT c and the corresponding critical electron concentration in one of the correlated bands are calculated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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