Multipole polaron in the devil's staircase of CeSb

ORAL

Abstract

CeSb has been an intriguing candidate for probing electronic correlations because of the anomalous magneto-structural transitions below TN~17 K, called “devil’s staircase". The established 4f order induces a tetragonal lattice contraction, dramatic changes in electron transports, and electronic reconstructions [1]. All these facts suggest the importance of the interplay between the localized 4f states and the itinerant electrons for understanding the anomalous transitions. However, revealing the underlying many-body interaction going through the devil’s staircase has remained out of reach.

Here, we examine the low-energy electronic structures of CeSb in the devil’s staircase, using laser angle-resolved photoemission spectroscopy, Raman spectroscopy, and neutron spectroscopy. We found a new type of electron–boson coupling, which leads to a unique quasiparticle state named the ‘multipole polaron’ [2]. This new coupling mediates between the itinerant electrons and the bosons constituted by the crystal-electric-field excitations of the localized 4f states.

[1] K. Kuroda, Y. Arai et al., Nat. Commun. 11, 2888 (2020). [2] Y. Arai et al., Nat. Mater. 21, 410 (2022).

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Publication: Y. Arai et al., Nat. Mater. 21, 410 (2022).

Presenters

  • Yosuke Arai

    • The University of Tokyo

Authors

  • Yosuke Arai

    • The University of Tokyo

  • Kenta Kuroda

    • Hiroshima University
    • Graduate School of Advanced Science and Engineering, Hiroshima Univ.
    • Hiroshima Univ

  • Takuya Nomoto

    • Univ of Tokyo
    • The University of Tokyo
    • RCAST, Univ of Tokyo
    • University of Tokyo

  • Zi How Tin

    • Osaka University

  • Shunsuke Sakuragi

    • The University of Tokyo

  • Cédric Bareille

    • The University of Tokyo

  • Shuntaro Akebi

    • The University of Tokyo

  • Kifu Kurokawa

    • The University of Tokyo

  • Yuto Kinoshita

    • The University of Tokyo

  • Weilu Zhang

    • The University of Tokyo

  • Shik Shin

    • The University of Tokyo
    • University of Tokyo

  • 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

  • Hideaki Kitazawa

    • National Institute for Materials Science

  • Yoshinori Haga

    • Japan Atomic Energy Agency

  • Hiroyuki Suzuki

    • The University of Tokyo

  • Shigeki Miyasaka

    • Osaka University

  • Setsuko Tajima

    • Osaka University

  • Kazuaki Iwasa

    • Ibaraki University

  • Ryotaro Arita

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

  • Takeshi Kondo

    • The University of Tokyo