title: Phase Diagram of Pyrochlore Iridates: All-in-All-out Magnetic Ordering and Non-Fermi-Liquid Properties.
abstract: We study the prototype 5d pyrochlore iridate Y_{2}Ir_{2}O_{7} from first principles using the local density approximation and dynamical mean-field theory (LDA+DMFT). We map out the phase diagram in the space of temperature, on-site Coulomb repulsion U, and filling. Consistent with experiments, we find that an all-in-all-out ordered insulating phase is stable for realistic values of U. The trigonal crystal field enhances the hybridization between the j_{eff}=1/2 and j_{eff}=3/2 states, and strong interband correlations are induced by the Coulomb interaction, which indicates that a three-band description is important. We demonstrate a substantial band narrowing in the paramagnetic metallic phase and non-Fermi-liquid behavior in the electron- or hole-doped system originating from long-lived quasi-spin-moments induced by nearly flat bands.
authors.affiliation: Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland.|Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shinaoka
authors.affiliation: Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland.|Department of Basic Science, The University of Tokyo, Meguro 153-8902, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Hoshino
authors.affiliation: Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland.
authors.forename: Matthias
authors.initials: M
authors.lastname: Troyer
authors.affiliation: Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland.
authors.forename: Philipp
authors.initials: P
authors.lastname: Werner