title: Gutzwiller theory of band magnetism in LaOFeAs.
abstract: We use the Gutzwiller variational theory to calculate the ground-state phase diagram and quasiparticle bands of LaOFeAs. The Fe3d-As4p Wannier-orbital basis obtained from density-functional theory defines the band part of our eight-band Hubbard model. The full atomic interaction between the electrons in the iron orbitals is parametrized by the Hubbard interaction U and an average Hund's-rule interaction J. We reproduce the experimentally observed small ordered magnetic moment over a large region of (U,J) parameter space. The magnetically ordered phase is a stripe spin-density wave of quasiparticles.
authors.affiliation: Department of Physics and Materials Science Center, Philipps Universität, 35032 Marburg, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Schickling
authors.forename: Florian
authors.initials: F
authors.lastname: Gebhard
authors.forename: Jörg
authors.initials: J
authors.lastname: Bünemann
authors.forename: Lilia
authors.initials: L
authors.lastname: Boeri
authors.forename: Ole K
authors.initials: OK
authors.lastname: Andersen
authors.forename: Werner
authors.initials: W
authors.lastname: Weber