Giant magnetoresistance and CDW instability in the quantum limit of correlated Dirac semimetal CaIrO<sub>3</sub>

ORAL

Abstract

The electron correlation in topological semimetals is an important subject of topological material physics. The quantum limit(QL), wherein electrons are quasi-one-dimensionally confined under the magnetic field, offers a fertile playground to study correlation induced non-trivial phases such as the topological CDW or excitonic insulator, but these phases remain to be fully explored experimentally.
In this study, we report the magnetoresistance up to 55 T for CaIrO3, which is a strongly-correlated Dirac semimetal on the verge of Mott transition[1,2]. We observed the giant positive longitudinal magnetoresistance in the QL, which steeply increases at 9 T, shows a peak around 18 T, and decreases at higher field. The activation energy derived by the Arrhenius plot also shows non-monotonic magnetic field dependence, which agrees well with the theoretical model of CDW instability[3]. Combining with the results of non-linear current-voltage property, we propose that disordered CDW is formed in the intermediate field region (9-25 T) of QL in CaIrO3.

[1] M. Zeb and H. Kee, PRB 86, 085149 (2012)
[2] J. Fujioka et al., Nat. Commun. 10, 362 (2019)
[3] H. Fukuyama, Solid State Commun. 26, 783 (1978)

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Presenters

  • Rinsuke Yamada

    • Department of Applied Physics, University of Tokyo

Authors

  • Rinsuke Yamada

    • Department of Applied Physics, University of Tokyo

  • Jun Fujioka

    • Faculty of Material Science, University of Tsukuba

  • Minoru Kawamura

    • RIKEN
    • CEMS, RIKEN
    • RIKEN CEMS

  • Shiro Sakai

    • CEMS, RIKEN

  • Motoaki Hirayama

    • RIKEN
    • University of Tokyo
    • Center for Emergent Matter Science, RIKEN
    • CEMS, RIKEN
    • Quantum-Phase Electronics Center, The University of Tokyo

  • Ryotaro Arita

    • Univ of Tokyo
    • University of Tokyo
    • Department of Applied Physics, Univ of Tokyo
    • CEMS, RIKEN
    • Department of Applied Physics, The University of Tokyo
    • RIKEN-CEMS

  • Tatsuta Okawa

    • Department of Applied Physics, University of Tokyo

  • Daisuke Hashizume

    • CEMS, RIKEN

  • Takuro Sato

    • CEMS, RIKEN

  • Fumitaka Kagawa

    • CEMS, RIKEN

  • Ryosuke Kurihara

    • ISSP, University of Tokyo
    • ISSP, The University of Tokyo

  • Masashi Tokunaga

    • Institute for Solid State Physics, University of Tokyo
    • ISSP, University of Tokyo
    • ISSP, The University of Tokyo
    • Univ of Tokyo

  • Yoshinori Tokura

    • RIKEN
    • RIKEN Center for Emergent Matter Science and Tokyo College, The University of Tokyo
    • CEMS, RIKEN
    • RIKEN CEMS
    • Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo