skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Antiferromagnetic Resonance and Terahertz Continuum in α - RuCl 3

Abstract

We report measurements of optical absorption in the zigzag antiferromagnet α-RuCl3 as a function of temperature T , magnetic field B , and photon energy ℏ ω in the range ~ 0.3 –8.3 meV, using time-domain terahertz spectroscopy. Polarized measurements show that threefold rotational symmetry is broken in the honeycomb plane from 2 to 300 K. We find a sharp absorption peak at 2.56 meV upon cooling below the Néel temperature of 7 K at B = 0 that we identify as the magnetic-dipole excitation of a zero-wave-vector magnon, or antiferromagnetic resonance (AFMR). With the application of B , the AFMR broadens and shifts to a lower frequency as long-range magnetic order is lost in a manner consistent with transitioning to a spin-disordered phase. From a direct, internally calibrated measurement of the AFMR spectral weight, we place an upper bound on the contribution to the dc susceptibility from a magnetic excitation continuum.

Authors:
 [1];  [2];  [3];  [4];  [1];  [1];  [4];  [4];  [3];  [5];  [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1412040
Alternate Identifier(s):
OSTI ID: 1410485
Grant/Contract Number:  
AC05-00OR22725; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Little, A., Wu, Liang, Lampen-Kelley, P., Banerjee, A., Patankar, S., Rees, D., Bridges, C. A., Yan, J. -Q., Mandrus, D., Nagler, S. E., and Orenstein, J. Antiferromagnetic Resonance and Terahertz Continuum in α-RuCl3. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.227201.
Little, A., Wu, Liang, Lampen-Kelley, P., Banerjee, A., Patankar, S., Rees, D., Bridges, C. A., Yan, J. -Q., Mandrus, D., Nagler, S. E., & Orenstein, J. Antiferromagnetic Resonance and Terahertz Continuum in α-RuCl3. United States. doi:10.1103/PhysRevLett.119.227201.
Little, A., Wu, Liang, Lampen-Kelley, P., Banerjee, A., Patankar, S., Rees, D., Bridges, C. A., Yan, J. -Q., Mandrus, D., Nagler, S. E., and Orenstein, J. Tue . "Antiferromagnetic Resonance and Terahertz Continuum in α-RuCl3". United States. doi:10.1103/PhysRevLett.119.227201. https://www.osti.gov/servlets/purl/1412040.
@article{osti_1412040,
title = {Antiferromagnetic Resonance and Terahertz Continuum in α-RuCl3},
author = {Little, A. and Wu, Liang and Lampen-Kelley, P. and Banerjee, A. and Patankar, S. and Rees, D. and Bridges, C. A. and Yan, J. -Q. and Mandrus, D. and Nagler, S. E. and Orenstein, J.},
abstractNote = {We report measurements of optical absorption in the zigzag antiferromagnet α-RuCl3 as a function of temperature T , magnetic field B , and photon energy ℏ ω in the range ~ 0.3 –8.3 meV, using time-domain terahertz spectroscopy. Polarized measurements show that threefold rotational symmetry is broken in the honeycomb plane from 2 to 300 K. We find a sharp absorption peak at 2.56 meV upon cooling below the Néel temperature of 7 K at B = 0 that we identify as the magnetic-dipole excitation of a zero-wave-vector magnon, or antiferromagnetic resonance (AFMR). With the application of B , the AFMR broadens and shifts to a lower frequency as long-range magnetic order is lost in a manner consistent with transitioning to a spin-disordered phase. From a direct, internally calibrated measurement of the AFMR spectral weight, we place an upper bound on the contribution to the dc susceptibility from a magnetic excitation continuum.},
doi = {10.1103/PhysRevLett.119.227201},
journal = {Physical Review Letters},
number = 22,
volume = 119,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

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


Frequency-dependent conductivity of electron glasses
journal, January 2004


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


Incommensurate counterrotating magnetic order stabilized by Kitaev interactions in the layered honeycomb α Li 2 IrO 3
journal, May 2016


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


Quantum spin liquids: a review
journal, November 2016


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


Low-energy electrodynamics of novel spin excitations in the quantum spin ice Yb2Ti2O7
journal, September 2014

  • Pan, LiDong; Kim, Se Kwon; Ghosh, A.
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms5970

Low-Energy Spin Dynamics of the Honeycomb Spin Liquid Beyond the Kitaev Limit
journal, July 2016


Spin-Induced Optical Conductivity in the Spin-Liquid Candidate Herbertsmithite
journal, September 2013


Resonant Inelastic X-Ray Scattering Response of the Kitaev Honeycomb Model
journal, September 2016


Noncoplanar and Counterrotating Incommensurate Magnetic Order Stabilized by Kitaev Interactions in γ Li 2 IrO 3
journal, November 2014


Scattering Continuum and Possible Fractionalized Excitations in α RuCl 3
journal, April 2015


α RuCl 3 : A spin-orbit assisted Mott insulator on a honeycomb lattice
journal, July 2014


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


Antiferromagnetic Resonance in CoCl 2 and FeCl 2
journal, March 1965

  • Jacobs, I. S.; Roberts, S.; Lawrence, P. E.
  • Journal of Applied Physics, Vol. 36, Issue 3
  • DOI: 10.1063/1.1714167

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


Quantum magnetism and criticality
journal, March 2008


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


Realization of a three-dimensional spin–anisotropic harmonic honeycomb iridate
journal, June 2014

  • Modic, K. A.; Smidt, Tess E.; Kimchi, Itamar
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms5203

Theory of Antiferromagnetism and Antiferromagnetic Resonance Absorption, I
journal, June 1951


Raman Scattering Signatures of Kitaev Spin Liquids in A 2 IrO 3 Iridates with A = Na or Li
journal, October 2014


Low-temperature crystal and magnetic structure of α RuCl 3
journal, April 2016


Two-dimensional gas of massless Dirac fermions in graphene
journal, November 2005

  • Novoselov, K. S.; Geim, A. K.; Morozov, S. V.
  • Nature, Vol. 438, Issue 7065, p. 197-200
  • DOI: 10.1038/nature04233

Mechanisms for sub-gap optical conductivity in Herbertsmithite
journal, June 2013


Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZn 2 Mo 3 O 8
journal, February 2014


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

Spin liquids in frustrated magnets
journal, March 2010


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


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


Magnetic order in α RuCl 3 : A honeycomb-lattice quantum magnet with strong spin-orbit coupling
journal, April 2015


Electronic orbital currents and polarization in Mott insulators
journal, July 2008


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


Simple theory of microwave absorption in alkali halides
journal, December 1982


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


Fundamental optical properties of α-RuCl3
journal, February 1979


Antiferromagentic resonance detected by direct current voltages in MnF 2 /Pt bilayers
journal, December 2015

  • Ross, Philipp; Schreier, Michael; Lotze, Johannes
  • Journal of Applied Physics, Vol. 118, Issue 23
  • DOI: 10.1063/1.4937913

Theory of Antiferromagnetic Resonance
journal, January 1952


Direct Determination of Exchange Parameters in Cs 2 CuBr 4 and Cs 2 CuCl 4 : High-Field Electron-Spin-Resonance Studies
journal, February 2014


Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na 2 IrO 3
journal, March 2012


Kitaev magnetism in honeycomb RuCl 3 with intermediate spin-orbit coupling
journal, June 2015


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


Fractionalized excitations in the spin-liquid state of a kagome-lattice antiferromagnet
journal, December 2012

  • Han, Tian-Heng; Helton, Joel S.; Chu, Shaoyan
  • Nature, Vol. 492, Issue 7429
  • DOI: 10.1038/nature11659

Fault-tolerant quantum computation by anyons
journal, January 2003


Dynamics of fractionalization in quantum spin liquids
journal, September 2015


Atomic-scale observation of structural and electronic orders in the layered compound α-RuCl3
journal, December 2016

  • Ziatdinov, M.; Banerjee, A.; Maksov, A.
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms13774

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


Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3
journal, May 2015

  • Hwan Chun, Sae; Kim, Jong-Woo; Kim, Jungho
  • Nature Physics, Vol. 11, Issue 6
  • DOI: 10.1038/nphys3322

Long-range magnetic ordering in Na 2 IrO 3
journal, June 2011


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