4 papers
Theory of Strongly Correlated Electron Systems. III. Including Correlation Effects into Electronic Structure Calculations
U. Lundin, I. Sandalov, O. Eriksson
In previous papers we showed that a division of the f-shell into two subsystems gives a better understanding of cohesive properties as well the general behavior of lanthanide syste…
Theory of Strongly Correlated Electron Systems. II.Intersite Coulomb Interaction and the Approximation of Renormalized Fermions in Total Energy Calculations
I. Sandalov, U. Lundin, O. Eriksson
The strong-coupling perturbation theory (SCPT) for correlated electron systems is extended to the case of full Coulomb interaction. The Coulomb mechanism of the orbital polarizatio…
Theory of strongly correlated f and d-electron systems. I. Exact Hamiltonian, Hubbard-Anderson models and perturbation theory near atomic limit within non-orthogonal basis set
Igor Sandalov, Borje Johansson, Olle Eriksson
The theory of correlated electron systems is formulated in a form which allows to use as a reference point an ab initio band structure theory (AIBST). The theory is constructed in…
On flux phase and Néel antiferromagnetism in the {\em t}-{\em J}-model}}
I. S. Sandalov, M. Richter
We reanalyse the mathematical formulation of the flux-state problem within the - model. The analysis of different parametrizations in the functional representation shows that…