Unconventional spin dynamics in the honeycomb-lattice material $\alpha$-RuCl$_3$: high-field ESR 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; S. A. Zvyagin

doi:10.1103/PhysRevB.96.241107

Unconventional spin dynamics in the honeycomb-lattice material $\alpha$-RuCl$_3$: high-field ESR studies

Strongly Correlated Electrons 2017-12-27 v2

Authors: 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 , S. A. Zvyagin

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Abstract

We present high-field electron spin resonance (ESR) studies of the honeycomb-lattice material $\alpha$ -RuCl $_3$ , 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 results of recent numerical calculations, strongly suggesting a very unconventional multiparticle character of the spin dynamics in $\alpha$ -RuCl $_3$ . 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.

Keywords

honeycomb-lattice α-RuCl₃ Kitaev physics high-field ESR spin dynamics antiferromagnetic resonance quantum paramagnetic phase multiparticle excitations

Cite

@article{arxiv.1706.07240,
  title  = {Unconventional spin dynamics in the honeycomb-lattice material $\alpha$-RuCl$_3$: high-field ESR studies},
  author = {A. N. Ponomaryov and E. Schulze and J. Wosnitza and P. Lampen-Kelley and A. Banerjee and J. -Q. Yan and C. A. Bridges and D. G. Mandrus and S. E. Nagler and A. K. Kolezhuk and S. A. Zvyagin},
  journal= {arXiv preprint arXiv:1706.07240},
  year   = {2017}
}

Unconventional spin dynamics in the honeycomb-lattice material $\alpha$-RuCl$_3$: high-field ESR studies

Abstract

Keywords

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