title: About the calculation of exchange coupling constants using density-functional theory: the role of the self-interaction error.
abstract: The effect of the correction of the self-interaction error on the calculation of exchange coupling constants with methods based on density-functional theory has been tested in simple model systems. The inclusion of the self-interaction correction cancels the nondynamical correlation energy contributions simulated by the commonly used functionals. Hence, such correction should be important in the accurate determination of exchange coupling constants. We have also tested several recent functionals to calculate exchange coupling constants in transition-metal complexes, such as meta-GGA functionals or new formulations of hybrid functionals. The influence of the basis set and of the use of pseudopotentials on the calculated J values has also been evaluated for a Fe(III) dinuclear complex in which the paramagnetic centers bear several unpaired electrons.
authors.affiliation: Departament de Química Inorgànica and Centre Especial de Recerca en Química Teòrica (CeRQT), Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain. eliseo.ruiz@qi.ub.es
authors.forename: Eliseo
authors.initials: E
authors.lastname: Ruiz
authors.forename: Santiago
authors.initials: S
authors.lastname: Alvarez
authors.forename: Joan
authors.initials: J
authors.lastname: Cano
authors.forename: Víctor
authors.initials: V
authors.lastname: Polo