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Nature of Magnetic Excitations in the High-Field Phase of αRuCl3

A. N. Ponomaryov, L. Zviagina, J. Wosnitza, P. Lampen-Kelley, A. Banerjee, J.-Q. Yan, C. A. Bridges, D. G. Mandrus, S. E. Nagler, and S. A. Zvyagin
Phys. Rev. Lett. 125, 037202 – Published 14 July 2020
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Abstract

We present comprehensive electron spin resonance (ESR) studies of in-plane oriented single crystals of αRuCl3, a quasi-two-dimensional material with honeycomb structure, focusing on its high-field spin dynamics. The measurements were performed in magnetic fields up to 16 T, applied along the [110] and [100] directions. Several ESR modes were detected. Combining our findings with recent inelastic neutron- and Raman-scattering data, we identified most of the observed excitations. Most importantly, we show that the low-temperature ESR response beyond the boundary of the magnetically ordered region is dominated by single- and two-particle processes with magnons as elementary excitations. The peculiarities of the excitation spectrum in the vicinity of the critical field are discussed.

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  • Received 26 March 2020
  • Revised 17 June 2020
  • Accepted 19 June 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.037202

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. N. Ponomaryov2,†, L. Zviagina2, J. Wosnitza2,3, P. Lampen-Kelley4,5, A. Banerjee1,‡, J.-Q. Yan4, C. A. Bridges6, D. G. Mandrus4,5, S. E. Nagler1, and S. A. Zvyagin2,*

  • 1Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 3Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
  • 4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37821, USA
  • 5Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37821, USA
  • 6Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37821, USA

  • *Corresponding author. s.zvyagin@hzdr.de
  • Present address: Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
  • Present address: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.

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Issue

Vol. 125, Iss. 3 — 17 July 2020

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