Unconventional spin dynamics in the honeycomb-lattice material α-RuCl3: 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.

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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