title: Dichotomy between large local and small ordered magnetic moments in iron-based superconductors.
abstract: We study a four-band model for iron-based superconductors within the local density approximation combined with dynamical mean-field theory (LDA+DMFT). This successfully reproduces the results of models which take As p degrees of freedom explicitly into account and has several physical advantages over the standard five d-band model. Our findings reveal that the new superconductors are more strongly correlated than their single-particle properties suggest. Two-particle correlation functions unveil the dichotomy between local and ordered magnetic moments in these systems, calling for further experiments to better resolve the short time scale spin dynamics.
authors.affiliation: Institut for Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria.
authors.forename: P
authors.initials: P
authors.lastname: Hansmann
authors.forename: R
authors.initials: R
authors.lastname: Arita
authors.forename: A
authors.initials: A
authors.lastname: Toschi
authors.forename: S
authors.initials: S
authors.lastname: Sakai
authors.forename: G
authors.initials: G
authors.lastname: Sangiovanni
authors.forename: K
authors.initials: K
authors.lastname: Held