Phase Diagram of Pyrochlore Iridates: All-in–All-out Magnetic Ordering and Non-Fermi-Liquid Properties

Hiroshi Shinaoka, Shintaro Hoshino, Matthias Troyer, and Philipp Werner
Phys. Rev. Lett. 115, 156401 – Published 7 October 2015
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Abstract

We study the prototype 5d pyrochlore iridate Y2Ir2O7 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 jeff=1/2 and jeff=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.

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  • Received 21 April 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.156401

© 2015 American Physical Society

Authors & Affiliations

Hiroshi Shinaoka1,2, Shintaro Hoshino3,2, Matthias Troyer1, and Philipp Werner2

  • 1Theoretische Physik, ETH Zürich, 8093 Zürich, Switzerland
  • 2Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
  • 3Department of Basic Science, The University of Tokyo, Meguro 153-8902, Japan

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Issue

Vol. 115, Iss. 15 — 9 October 2015

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