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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