Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10810
Title: The role of dynamical polarization of the ligand-to-metal charge transfer excitations in the ab initio determination of effective exchange parameters
Author: Gellé, Alain
Munzarová, Markéta L.
Lepetit, Marie-Bernadette
Illas i Riera, Francesc
Keywords: Estructura electrònica
Superconductivitat
Electronic structure
Superconductivity
Issue Date: 2003
Publisher: The American Physical Society
Abstract: The role of the bridging ligand on the effective Heisenberg coupling parameters is analyzed in detail. This analysis strongly suggests that the ligand-to-metal charge transfer excitations are responsible for a large part of the final value of the magnetic coupling constant. This permits us to suggest a variant of the difference dedicated configuration interaction (DDCI) method, presently one of the most accurate and reliable for the evaluation of magnetic effective interactions. This method treats the bridging ligand orbitals mediating the interaction at the same level than the magnetic orbitals and preserves the high quality of the DDCI results while being much less computationally demanding. The numerical accuracy of the new approach is illustrated on various systems with one or two magnetic electrons per magnetic center. The fact that accurate results can be obtained using a rather reduced configuration interaction space opens the possibility to study more complex systems with many magnetic centers and/or many electrons per center.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.68.125103
It is part of: Physical Review B, 2003, vol. 68, núm. 12, p. 125103-1-125103-7
URI: http://hdl.handle.net/2445/10810
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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