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Unconventional spin dynamics in the honeycomb-lattice material αRuCl3: High-field electron spin resonance studies

A. N. Ponomaryov, E. Schulze, J. Wosnitza, P. Lampen-Kelley, A. Banerjee, J.-Q. Yan, C. A. Bridges, D. G. Mandrus, S. E. Nagler, A. K. Kolezhuk, and S. A. Zvyagin
Phys. Rev. B 96, 241107(R) – Published 19 December 2017

Abstract

We present high-field electron spin resonance (ESR) studies of the honeycomb-lattice material αRuCl3, a prime candidate to exhibit Kitaev physics. Two modes of antiferromagnetic resonance were detected in the zigzag ordered phase, with magnetic field applied in the ab plane. A very rich excitation spectrum was observed in the field-induced quantum paramagnetic phase. The obtained data are compared with the results of recent numerical calculations, strongly suggesting a very unconventional multiparticle character of the spin dynamics in αRuCl3. The frequency-field diagram of the lowest-energy ESR mode is found consistent with the behavior of the field-induced energy gap, revealed by thermodynamic measurements.

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  • Received 22 June 2017
  • Revised 29 November 2017

DOI:https://doi.org/10.1103/PhysRevB.96.241107

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. N. Ponomaryov1, E. Schulze1,2, J. Wosnitza1,2, P. Lampen-Kelley3,4, A. Banerjee5, J.-Q. Yan3, C. A. Bridges6, D. G. Mandrus3, S. E. Nagler5, A. K. Kolezhuk7,8, and S. A. Zvyagin1

  • 1Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
  • 2Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
  • 3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37821, USA
  • 4Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37821, USA
  • 5Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37821, USA
  • 6Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37821, USA
  • 7Institute of High Technologies, Taras Shevchenko National University of Kyiv, 03022 Kyiv, Ukraine
  • 8Institute of Magnetism, National Academy of Sciences and Ministry of Education, 03142 Kyiv, Ukraine

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Issue

Vol. 96, Iss. 24 — 15 December 2017

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