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Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality

Author

Listed:
  • Kentaro Ueda

    (University of Tokyo)

  • Taekoo Oh

    (Seoul National University
    Center for Correlated Electron Systems, Institute for Basic Science (IBS))

  • Bohm-Jung Yang

    (Seoul National University
    Center for Correlated Electron Systems, Institute for Basic Science (IBS)
    Center for Theoretical Physics (CTP), Seoul National University)

  • Ryoma Kaneko

    (University of Tokyo)

  • Jun Fujioka

    (University of Tokyo
    PRESTO, Japan Science and Technology Agency)

  • Naoto Nagaosa

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

  • Yoshinori Tokura

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

The interplay between electron correlation and spin–orbit coupling in solids has been proven to be an abundant gold mine for emergent topological phases. Here we report the results of systematic magnetotransport study on bandwidth-controlled pyrochlore iridates R2Ir2O7 near quantum metal-insulator transition (MIT). The application of a magnetic field along [001] crystallographic direction (H//[001]) significantly decreases resistivity while producing a unique Hall response, which indicates the emergence of the novel semi-metallic state in the course of the magnetic transformation from all-in all-out (AIAO, 4/0) to 2-in 2-out (2/2) spin configuration. For H//[111] that favours 3-in 1-out (3/1) configuration, by contrast, the resistivity exhibits saturation at a relatively high value typical of a semimetal. The observed properties can be identified to reflect the emergence of multiple Weyl semimetal states with varying numbers of Weyl points and line nodes in respective spin configurations. With tuning effective bandwidth, all these states appear to concentrate around the quantum MIT region, which may open a promising venue for topological phenomena and functions.

Suggested Citation

  • Kentaro Ueda & Taekoo Oh & Bohm-Jung Yang & Ryoma Kaneko & Jun Fujioka & Naoto Nagaosa & Yoshinori Tokura, 2017. "Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality," Nature Communications, Nature, vol. 8(1), pages 1-7, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15515
    DOI: 10.1038/ncomms15515
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