Unconventional spin dynamics in the honeycomb-lattice material α-RuCl<sub>3</sub>: high-field ESR studies

ORAL

Abstract

We performed comprehensive multi-frequency high-field electron spin resonance (ESR) studies of α-RuCl3, an anisotropic spin system with a honeycomb structure, a top candidate for exhibiting Kitaev's spin-liquid physics. Two modes of antiferromagnetic resonance were detected in the zigzag-ordered phase. Magnetic field applied in the ab plane suppresses the zigzag order, resulting in a significant change of the excitation spectrum. Four ESR modes were observed in the field-induced quantum paramagnetic state above Hc ~ 7 T, suggesting an unconventioanl multiparticle nature of magnetic excitations in α-RuCl3. The obtained data are compared with results of recent numerical calculations, revealing good qualitative agreement.

*This work was partially supported by the Deutsche Forschungsgemeinschaft, the U.S. Department of Energy, and the Gordon and Betty Moore Foundation.

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Presenters

  • Sergei Zvyagin

    • Helmholtz-Zentrum Dresden-Rossendorf

Authors

  • Sergei Zvyagin

    • Helmholtz-Zentrum Dresden-Rossendorf

  • Alexei Ponomaryov

    • Helmholtz-Zentrum Dresden-Rossendorf

  • E. Schulze

    • Helmholtz-Zentrum Dresden-Rossendorf

  • Joachim Wosnitza

    • Helmholtz-Zentrum Dresden-Rossendorf
    • Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden

  • 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

  • Jiaqiang Yan

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

  • Craig Bridges

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • 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

  • Alexei Kolezhuk

    • Taras Shevchenko National University of Kyiv