Field-direction dependent quantum-limit magnetoresistance in correlated Dirac semimetal CaIrO<sub>3</sub>

ORAL

Abstract

The electron correlation in topological semimetals has been an important subject in topological material physics. The quantum confinement of strongly correlated relativistic electrons into quasi-one-dimension under a strong magnetic field (B) offers a fertile ground for exploring the emergent correlated topological phenomena, but has been rarely realized so far.

In this study, we report a largely anisotropic quantum-limit magnetoresistance (MR) in perovskite CaIrO3, which is a strongly-correlated Dirac semimetal on the verge of Mott transition [1,2]. The resistivity for B || a shows an insulating behavior with the MR ratio exceeding 2000 % around 18 T, whereas the B || c MR always remains metallic. This is accounted for in terms of that the large difference of Fermi velocity of the n = 0 Landau level between B || a and B || c due to the B-direction dependent 5d orbital electron hopping, which triggers the different instability toward the charge density wave formation for the one-dimensional (|| B) dispersive n = 0 Landau level [3].



[1] M. Zeb and H. Kee, Physical Review B 86, 085149 (2012)

[2] J. Fujioka et al., Nature Communications 10, 362 (2019)

[3] R. Yamada et al., npj Quantum Materials 7, 13 (2022)

*This work was supported by a Japan Society for the Promotion of Science KAKENHI (Grants 22H01177, 21K18813, No. 20J21312, No. 18H01171, No. 18H04214, No. 16H00981, and No. 16H06345) from the MEXT and by PRESTO (Grant No. JPMJPR15R5) and CREST (Grants No. JPMJCR16F1), Japan Science and Technology Japan.

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Publication: submitted to Physical Review B

Presenters

  • Rinsuke Yamada

    • Univ of Tokyo
    • University of Tokyo

Authors

  • Rinsuke Yamada

    • Univ of Tokyo
    • University of Tokyo

  • Jun Fujioka

    • Tsukuba University

  • Minoru Kawamura

    • RIKEN
    • RIKEN CEMS
    • RIKEN, Center for Emergent Matter Science

  • Shiro Sakai

    • RIKEN

  • Motoaki Hirayama

    • RIKEN
    • Univ of Tokyo

  • Ryotaro Arita

    • The University of Tokyo
    • Univ of Tokyo
    • Univ of Tokyo, RIKEN CEMS
    • University of Tokyo
    • the University of Tokyo

  • Tatsuya Okawa

    • Univ of Tokyo

  • Daisuke Hashizume

    • RIKEN

  • Ryosuke Kurihara

    • Univ of Tokyo
    • Tokyo University of Science

  • Masashi Tokunaga

    • Univ of Tokyo
    • The University of Tokyo
    • Institute for Solid State Physics (ISSP)
    • ISSP, The Univ. of Tokyo
    • The Institute for Solid-State Physics, University of Tokyo

  • Yoshinori Tokura

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