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Title: Unconventional spin dynamics in the honeycomb-lattice material α - RuCl 3 : High-field electron spin resonance studies

Abstract

Here, we present high-field electron spin resonance (ESR) studies of the honeycomb-lattice material α-RuCl3, 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 a b plane. A very rich excitation spectrum was observed in the field-induced quantum paramagnetic phase. We compare the data obtained with the results of recent numerical calculations, strongly suggesting a very unconventional multiparticle character of the spin dynamics in α-RuCl3. Finally, 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.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [5];  [4];  [7];  [1]
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  1. Helmholtz-Zentrum Berlin (HZB), (Germany). Dresden High Magnetic Field Lab. (HLD-EMFL)
  2. Helmholtz-Zentrum Berlin (HZB), (Germany). Dresden High Magnetic Field Lab. (HLD-EMFL); Technical Univ. of Dresden (Germany). Inst. of Solid State and Material Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum of Materials Science and Engineering
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Science Division
  7. Taras Shevchenko National Univ., Kyiv (Ukraine). Inst. of High Technologies; National Academy of Sciences and Ministry of Education, Kyiv (Ukraine). Inst. of Magnetism
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1414677
Alternate Identifier(s):
OSTI ID: 1414037
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ponomaryov, A. N., Schulze, E., Wosnitza, J., Lampen-Kelley, P., Banerjee, A., Yan, J. -Q., Bridges, C. A., Mandrus, D. G., Nagler, S. E., Kolezhuk, A. K., and Zvyagin, S. A. Unconventional spin dynamics in the honeycomb-lattice material α-RuCl3 : High-field electron spin resonance studies. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.241107.
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Ponomaryov, A. N., Schulze, E., Wosnitza, J., Lampen-Kelley, P., Banerjee, A., Yan, J. -Q., Bridges, C. A., Mandrus, D. G., Nagler, S. E., Kolezhuk, A. K., & Zvyagin, S. A. Unconventional spin dynamics in the honeycomb-lattice material α-RuCl3 : High-field electron spin resonance studies. United States. https://doi.org/10.1103/PhysRevB.96.241107
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Ponomaryov, A. N., Schulze, E., Wosnitza, J., Lampen-Kelley, P., Banerjee, A., Yan, J. -Q., Bridges, C. A., Mandrus, D. G., Nagler, S. E., Kolezhuk, A. K., and Zvyagin, S. A. Tue . "Unconventional spin dynamics in the honeycomb-lattice material α-RuCl3 : High-field electron spin resonance studies". United States. https://doi.org/10.1103/PhysRevB.96.241107. https://www.osti.gov/servlets/purl/1414677.
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@article{osti_1414677,
title = {Unconventional spin dynamics in the honeycomb-lattice material α-RuCl3 : High-field electron spin resonance studies},
author = {Ponomaryov, A. N. and Schulze, E. and Wosnitza, J. and Lampen-Kelley, P. and Banerjee, A. and Yan, J. -Q. and Bridges, C. A. and Mandrus, D. G. and Nagler, S. E. and Kolezhuk, A. K. and Zvyagin, S. A.},
abstractNote = {Here, we present high-field electron spin resonance (ESR) studies of the honeycomb-lattice material α-RuCl3, 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 a b plane. A very rich excitation spectrum was observed in the field-induced quantum paramagnetic phase. We compare the data obtained with the results of recent numerical calculations, strongly suggesting a very unconventional multiparticle character of the spin dynamics in α-RuCl3. Finally, 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.},
doi = {10.1103/PhysRevB.96.241107},
journal = {Physical Review B},
number = 24,
volume = 96,
place = {United States},
year = {Tue Dec 19 00:00:00 EST 2017},
month = {Tue Dec 19 00:00:00 EST 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.96.241107
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Cited by: 49 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic view of the α-RuCl3 crystal structure in the trigonal setting (ab view). The Ru3+ ions are shown in cyan, while the Cl− ions are shown in red. (b) The reciprocal lattice of the honeycomb lattice (first and second Brillouin zones are shown).
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Works referenced in this record:

Field-induced quantum criticality in the Kitaev system α − RuCl 3
journal, July 2017

Breakdown of magnons in a strongly spin-orbital coupled magnet
journal, October 2017

Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
journal, April 2016

  • Banerjee, A.; Bridges, C. A.; Yan, J. -Q.
  • Nature Materials, Vol. 15, Issue 7
  • DOI: 10.1038/nmat4604

High-field ESR study of the dimerized-incommensurate phase transition in the spin-Peierls compound CuGeO3
journal, April 2004

Numerical Study of a Model for NENP: One-Dimensional S =1 Antiferromagnetin a Staggered Field
journal, March 1994

  • Sakai, Tôru; Shiba, Hiroyuki
  • Journal of the Physical Society of Japan, Vol. 63, Issue 3
  • DOI: 10.1143/JPSJ.63.867

Anyons in an exactly solved model and beyond
journal, January 2006

Dynamics of a Two-Dimensional Quantum Spin Liquid: Signatures of Emergent Majorana Fermions and Fluxes
journal, May 2014

Monoclinic crystal structure of α − RuCl 3 and the zigzag antiferromagnetic ground state
journal, December 2015

Phase diagram of α − RuCl 3 in an in-plane magnetic field
journal, May 2017

Unpaired Majorana modes in the gapped phase of Kitaev's honeycomb model
journal, October 2013

Neutron scattering in the proximate quantum spin liquid α-RuCl 3
journal, June 2017

Hyperhoneycomb Iridate β − Li 2 IrO 3 as a Platform for Kitaev Magnetism
journal, February 2015

Evidence for a Field-Induced Quantum Spin Liquid in α - RuCl 3
journal, July 2017

Relevance of the Heisenberg-Kitaev Model for the Honeycomb Lattice Iridates A 2 IrO 3
journal, March 2012

Majorana fermions in the Kitaev quantum spin system α-RuCl3
journal, September 2017

  • Do, Seung-Hwan; Park, Sang-Youn; Yoshitake, Junki
  • Nature Physics, Vol. 13, Issue 11
  • DOI: 10.1038/nphys4264

Field-induced gap in a quantum spin- 1 2 chain in a strong magnetic field
journal, February 2011

Successive magnetic phase transitions in α − RuCl 3 : XY-like frustrated magnet on the honeycomb lattice
journal, March 2015

Anomalous Thermal Conductivity and Magnetic Torque Response in the Honeycomb Magnet α − RuCl 3
journal, May 2017

Antiferromagnetic Resonance and Terahertz Continuum in α − RuCl 3
journal, November 2017

Magnetic Excitations and Continuum of a Possibly Field-Induced Quantum Spin Liquid in α − RuCl 3
journal, November 2017

Exact Results for Spin Dynamics and Fractionalization in the Kitaev Model
journal, June 2007

Kitaev exchange and field-induced quantum spin-liquid states in honeycomb α-RuCl3
journal, November 2016

  • Yadav, Ravi; Bogdanov, Nikolay A.; Katukuri, Vamshi M.
  • Scientific Reports, Vol. 6, Issue 1
  • DOI: 10.1038/srep37925

Kitaev-Heisenberg Model on a Honeycomb Lattice: Possible Exotic Phases in Iridium Oxides A 2 IrO 3
journal, July 2010

Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
journal, January 2009

Honeycomb-Lattice Heisenberg-Kitaev Model in a Magnetic Field: Spin Canting, Metamagnetism, and Vortex Crystals
journal, December 2016

Spin-Wave Excitations Evidencing the Kitaev Interaction in Single Crystalline α − RuCl 3
journal, March 2017

Neutron scattering in the proximate quantum spin liquid α-RuCl3.
text, January 2017

  • Banerjee, Arnab; Yan, Jiaqiang; Knolle, Johannes
  • Apollo - University of Cambridge Repository
  • DOI: 10.17863/cam.11028

Exact results for spin dynamics and fractionization in the Kitaev Model
text, January 2006

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    Works referencing / citing this record:

    Observation of two types of fractional excitation in the Kitaev honeycomb magnet
    journal, May 2018

    Concept and realization of Kitaev quantum spin liquids
    journal, March 2019

    • Takagi, Hidenori; Takayama, Tomohiro; Jackeli, George
    • Nature Reviews Physics, Vol. 1, Issue 4
    • DOI: 10.1038/s42254-019-0038-2

    Kitaev honeycomb models in magnetic fields: Dynamical response and dual models
    journal, October 2019

    Two-step gap opening across the quantum critical point in the Kitaev honeycomb magnet α − RuCl 3
    journal, January 2020

    Successive Majorana topological transitions driven by a magnetic field in the Kitaev model
    journal, August 2018

    Field-induced magnon excitation and in-gap absorption in the Kitaev candidate RuCl 3
    journal, September 2018

    Field evolution of magnons in α − RuCl 3 by high-resolution polarized terahertz spectroscopy
    journal, September 2018

    Signatures of low-energy fractionalized excitations in α − RuCl 3 from field-dependent microwave absorption
    journal, November 2018

    Observation of two types of fractional excitation in the Kitaev honeycomb magnet
    text, January 2018

    Topological Magnons in Kitaev Magnets at High Fields
    text, January 2018

    Dynamical and Topological Properties of the Kitaev Model in a [111] Magnetic Field
    text, January 2018

    Successive Majorana Topological Transitions Driven by a Magnetic Field in the Kitaev Model
    text, January 2018

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      Figures / Tables found in this record:

      FIG. 1 (p. 2)figure
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      FIG. 3 (p. 2)figure
      FIG. 4 (p. 3)figure
      FIG. 5 (p. 3)figure
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