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VOLUME 88 (2008) | ISSUE 11 | PAGE 844
Density-functional calculation of the Coulomb repulsion and correlation strength in superconducting LaFeAsO
Constrained density functional theory scheme in Wannier functions formalism has been used to calculate Coulomb repulsion U and Hund's exchange J parameters for Fe-3d electrons in LaFeAsO. Results strongly depend on the basis set. When O-2p, As-4p, and Fe-3d orbitals are included, computation results in U=3\div4 eV. With the basis set restricted to Fe-3d orbitals only, computation gives parameters corresponding to F0=0.8 eV, J=0.5 eV. Local Density Approximation combined with Dynamical Mean-Field Theory calculation with these parameters results in weakly correlated electronic structure.