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Field-induced exotic metal in Kondo insulator YbB<sub>12</sub>

ORAL

Abstract

YbB12, a representative Kondo insulator, has attracted attention in recent years as it exhibits Shubnikov-de Haas effect in intense magnetic fields [1]. With the magnetic field further increasing, YbB12 goes through an insulator-to-metal transition. We systematically studied the high field metallic state in YbB12 in pulsed magnetic fields. The temperature dependence of the resistivity in this state reveals a crossover from non-Fermi-liquid behavior above 4 K to Fermi-liquid-like behavior below 2 K. This Fermi-liquid-like state also shows unusually large Kadowaki-Woods ratio. Results of the quantum oscillation measurements provide evidence that the electronic band structure is depicted by a two-fluid picture where unusual quasiparticles, contributing little or nothing to charge transport, coexist with the conventional fermions.

[1] Z. Xiang, et al. Science 362, 65-69 (2018).

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Presenters

  • Ziji Xiang

    University of Michigan

Authors

  • Ziji Xiang

    University of Michigan

  • Lu Chen

    University of Michigan

  • Kuan-Wen Chen

    University of Michigan

  • Colin B Tinsman

    University of Michigan

  • Yuki Sato

    Kyoto Univ, Physics, Kyoto University, Department of physics, Kyoto University

  • Tomoya Asaba

    Los Alamos National laboratory, University of Michigan

  • Helen Lu

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, National High Magnetic Field Laboratory (NHMFL), Los Alamos

  • Yuichi Kasahara

    Department of Physics, Kyoto University, Kyoto Univ, Physics, Kyoto University, Department of physics, Kyoto University

  • Marcelo Jaime

    Los Alamos National Laboratory, Los Alamos Natl Lab, National High Magnetic Field Laboratory (NHMFL), Los Alamos

  • Fedor Balakirev

    Los Alamos National Laboratory, Los Alamos Natl Lab, National High Magnetic Field Laboratory (NHMFL), Los Alamos

  • Fumitoshi Iga

    Ibaraki University

  • Yuji Matsuda

    Department of Physics, Kyoto University, Kyoto Univ, Physics, Kyoto University, Department of physics, Kyoto University

  • John Singleton

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos National Lab, Los Alamos National Laboratory, LANL, NHMFL, National High Magnetic Field Laboratory (NHMFL), Los Alamos

  • Lu Li

    University of Michigan