Phase diagram of pyrochlore iridates: all-in\char21{}All-out magnetic ordering and non-Fermi-liquid properties
- Shinaoka, Hiroshi Theoretische Physik, ETH Zürich, Switzerland - Department of Physics, University of Fribourg, Switzerland
- Hoshino, Shintaro Department of Physics, University of Fribourg, Switzerland - Department of Basic Science, The University of Tokyo, Japan
- Troyer, Matthias Theoretische Physik, ETH Zürich, Switzerland
- Werner, Philipp Department of Physics, University of Fribourg, Switzerland
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07.10.2015
Published in:
- Physical Review Letters. - 2015, vol. 115, no. 15, p. 156401
English
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.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 258068
- DOI 10.1103/PhysRevLett.115.156401
- Persistent URL
- https://folia.unifr.ch/unifr/documents/304687
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