Antiferromagnetic Resonance and Terahertz Continuum in α-RuCl3

ORAL

Abstract

We report time-domain THz spectroscopy measurements of α-RuCl3 as a function of temperature and applied in-plane magnetic field, H, in the energy range 0.3 to 8.3 meV. Polarized measurements show that at zero field, 3-fold rotational symmetry is broken in the honeycomb plane from 2 K to 300 K. Below TN, and with B(t) parallel H, we observe an antiferromagnetic resonance (AFMR) peak at 2.56 meV atop a large broadband continuum which can attributed largely to electric dipole absorption. We track the evolution of the AMFR peak from H = 0 T to 7 T as it broadens and shifts to lower frequency. From spectral weight analysis of this peak, we place an upper bound on the contribution to the dc susceptibility from a magnetic excitation continuum. Ref. arxiv:1704.07357

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Presenters

  • Arielle Little

    Univ of California - Berkeley

Authors

  • Arielle Little

    Univ of California - Berkeley

  • Liang Wu

    Univ of California - Berkeley

  • Paula Lampen-Kelley

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Arnab Banerjee

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge National Lab, Oak Ridge National Laboratory

  • Shreyas Patankar

    Physics, Univ of California - Berkeley, Univ of California - Berkeley, Physics, University of California, Berkeley

  • Dylan Rees

    Univ of California - Berkeley

  • Craig Bridges

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Jiaqiang Yan

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge National Lab, Oak Ridge National Laboratory, Ames Laboratory, Iowa State University

  • David Mandrus

    Department of Materials Science and Engineering, The University of Tennessee, Oak Ridge National Lab, Oak Ridge National Laboratory, Department of Materials Science and Engineering, University of Tennessee, University of Tennessee, Materials Science and Technology, Oak Ridge National Laboratory, Materials Science and Engineering, The University of Tennessee, Materials Science and Engineering, University of Tennessee, Material Science and Technology Division, Oak Ridge National Laboratory, Oakridge National Laboratory, University of Tennessee, Knoxville, Univ of Tennessee, Knoxville

  • Stephen Nagler

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge National Lab, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory

  • Joseph Orenstein

    Physics, Univ of California - Berkeley, Univ of California - Berkeley, Physics, University of California, Berkeley