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Field-induced “exotic metal” phase 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. With the magnetic field further increasing, YbB12 goes through an insulator-to-metal transition. We systematically studied the high field metallic phase in YbB12 in pulsed magnetic fields. The temperature dependence of the resistivity in this phase reveals a crossover from non-Fermi-liquid behavior above 4 K to Fermi-liquid-like behavior below 2 K. The low-temperature state also shows unusually large Kadowaki-Woods ratio. Results of the proximity detector oscillator measurements provide evidences that the electronic structure of YbB12 in the metallic phase depends on both the strength and the orientation of external magnetic fields.

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Presenters

  • Ziji Xiang

    Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, University of Michigan

Authors

  • Ziji Xiang

    Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, University of Michigan

  • Yuichi Kasahara

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

  • Lu Chen

    Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, University of Michigan

  • Tomoya Asaba

    Univ of Michigan - Ann Arbor, Physics, University of Michigan, Los Alamos National Laboratory, University of Michigan

  • Yuki Sato

    Department of Physics, Kyoto University, Dept. Phys., Kyoto Univ., Kyoto Univ, Physics, Kyoto University

  • Colin B Tinsman

    Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, University of Michigan

  • Fumitoshi Iga

    College of Science, Ibaraki University, Institute for Quantum Beam Science, Ibaraki University

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

  • Yuji Matsuda

    Department of Physics, Kyoto University, Department of Physics, Kyoto Univ, Dept. Phys., Kyoto Univ., Kyoto Univ, Physics, Kyoto University, Kyoto University

  • Lu Li

    Univ of Michigan - Ann Arbor, Department of Physics, University of Michigan, Physics, University of Michigan, University of Michigan