Variation of Charge Dynamics in the Course of Metal-Insulator Transition for Pyrochlore-Type
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- 27 September 2012
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 109 (13), 136402
- https://doi.org/10.1103/physrevlett.109.136402
Abstract
We have spectroscopically investigated the thermally and doping-induced metal-insulator transitions for pyrochlore-type as well as its Rh-doped analogs , where the spin-orbit interaction as well as the electron correlation is effectively tuned by the doping level (). The charge dynamics dramatically changes on an energy scale of 1 eV in the course of thermally and doping-induced metal-insulator transitions, while the insulating ground state shows a small but well-defined charge gap of 45 meV. Anomalous doping variation of the low-energy () optical-conductivity spectra at the ground state can be interpreted in terms of the phase changes among the narrow-gap Mott insulator, Weyl semimetal, and correlated metal.
This publication has 22 references indexed in Scilit:
- Topological and magnetic phases of interacting electrons in the pyrochlore iridatesPhysical Review B, 2012
- Metal–Insulator Transitions in Pyrochlore Oxides Ln2Ir2O7Journal of the Physics Society Japan, 2011
- Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridatesPhysical Review B, 2011
- Topological Insulators from Spontaneous Symmetry Breaking Induced by Electron Correlation on Pyrochlore LatticesJournal of the Physics Society Japan, 2011
- Competing exotic topological insulator phases in transition-metal oxides on the pyrochlore lattice with distortionPhysical Review B, 2011
- Topological insulators and metal-insulator transition in the pyrochlore iridatesPhysical Review B, 2010
- Mott physics and band topology in materials with strong spin–orbit interactionNature Physics, 2010
- Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr 2 IrO 4Science, 2009
- Dimensionality-Controlled Insulator-Metal Transition and Correlated Metallic State in Transition Metal Oxides (, 2, and )Physical Review Letters, 2008
- Metal-insulator transitionsReviews of Modern Physics, 1998