Premium
On the origin of localized magnetic states in transition metal alloys I. Wolff model
Author(s) -
Morkowski J.,
Oleś A. M.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220920223
Subject(s) - hamiltonian (control theory) , condensed matter physics , coulomb , degeneracy (biology) , impurity , magnetic moment , physics , hubbard model , anderson impurity model , density of states , magnetic impurity , quantum mechanics , mathematics , electron , superconductivity , mathematical optimization , bioinformatics , biology
The generalized Wolff Hamiltonian is solved in approximations which are exact in the limit of isolated impurity. It is shown that approximations analogical to those developed by Hubbard in the narrow band Hamiltonian overestimate the effect of Coulomb correlations. The formation of localized magnetic moments is described in the selfconsistent approach, which conserves first four moments of the spectral density function. The results indicate that the degeneracy of impurity levels is essential for transition metal systems.