Breakdown of magnons in a strongly spin-orbital coupled magnet

doi:10.1038/s41467-017-01177-0

Title: Breakdown of magnons in a strongly spin-orbital coupled magnet

Abstract

The description of quantized collective excitations stands as a landmark in the quantum theory of condensed matter. A prominent example occurs in conventional magnets, which support bosonic magnons—quantized harmonic fluctuations of the ordered spins. In striking contrast is the recent discovery that strongly spin-orbital-coupled magnets, such as α-RuCl ₃, may display a broad excitation continuum inconsistent with conventional magnons. Due to incomplete knowledge of the underlying interactions unraveling the nature of this continuum remains challenging. The most discussed explanation refers to a coherent continuum of fractional excitations analogous to the celebrated Kitaev spin liquid. Here, we present a more general scenario. We propose that the observed continuum represents incoherent excitations originating from strong magnetic anharmonicity that naturally occurs in such materials. This scenario fully explains the observed inelastic magnetic response of α-RuCl ₃ and reveals the presence of nontrivial excitations in such materials extending well beyond the Kitaev state.

Authors:

^[1]; Riedl, Kira ^[1]; Maksimov, Pavel A. ^[2]; Chernyshev, Alexander L. ^[2];

^[3]; Valentí, Roser ^[1]

Goethe-Universität Frankfurt (Germany)
Univ. of California, Irvine, CA (United States)
Université de Cergy-Pontoise (France)

Publication Date:: 2017-10-27

Research Org.:: Univ. of California, Irvine, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI Identifier:: 1499928

Grant/Contract Number:: FG02-04ER46174

Resource Type:: Accepted Manuscript

Journal Name:: Nature Communications

Additional Journal Information:: Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Winter, Stephen M., Riedl, Kira, Maksimov, Pavel A., Chernyshev, Alexander L., Honecker, Andreas, and Valentí, Roser. Breakdown of magnons in a strongly spin-orbital coupled magnet.  United States: N. p., 2017. 
        Web.  doi:10.1038/s41467-017-01177-0.

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                    Winter, Stephen M., Riedl, Kira, Maksimov, Pavel A., Chernyshev, Alexander L., Honecker, Andreas, & Valentí, Roser. Breakdown of magnons in a strongly spin-orbital coupled magnet.  United States.  doi:10.1038/s41467-017-01177-0.

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                    Winter, Stephen M., Riedl, Kira, Maksimov, Pavel A., Chernyshev, Alexander L., Honecker, Andreas, and Valentí, Roser. Fri .  
        "Breakdown of magnons in a strongly spin-orbital coupled magnet".  United States.  doi:10.1038/s41467-017-01177-0.  https://www.osti.gov/servlets/purl/1499928.

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@article{osti_1499928,

  title        = {Breakdown of magnons in a strongly spin-orbital coupled magnet},

  author       = {Winter, Stephen M. and Riedl, Kira and Maksimov, Pavel A. and Chernyshev, Alexander L. and Honecker, Andreas and Valentí, Roser},

  abstractNote = {The description of quantized collective excitations stands as a landmark in the quantum theory of condensed matter. A prominent example occurs in conventional magnets, which support bosonic magnons—quantized harmonic fluctuations of the ordered spins. In striking contrast is the recent discovery that strongly spin-orbital-coupled magnets, such as α-RuCl3, may display a broad excitation continuum inconsistent with conventional magnons. Due to incomplete knowledge of the underlying interactions unraveling the nature of this continuum remains challenging. The most discussed explanation refers to a coherent continuum of fractional excitations analogous to the celebrated Kitaev spin liquid. Here, we present a more general scenario. We propose that the observed continuum represents incoherent excitations originating from strong magnetic anharmonicity that naturally occurs in such materials. This scenario fully explains the observed inelastic magnetic response of α-RuCl3 and reveals the presence of nontrivial excitations in such materials extending well beyond the Kitaev state.},

  doi          = {10.1038/s41467-017-01177-0},

  journal      = {Nature Communications},

  number       = 1,

  volume       = 8,

  place        = {United States},

  year         = {2017},

  month        = {10}

}

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DOI: 10.1038/s41467-017-01177-0

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Cited by: 46 works

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Figures / Tables:

Fig. 1 : From material to model. Within the honeycomb ab-layer of $α$-RuCl₃ are illustrated the RuCl₆ octahedra, magnetic zigzag ordering pattern, and definition of the underlying magnetic interactions. Crystal axes are labeled with respect to the C2/m structure

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Title: Breakdown of magnons in a strongly spin-orbital coupled magnet

Abstract

Citation Formats

Figures / Tables:

Scattering factors computed from relativistic Dirac–Slater wave functions journal, January 1965

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

Spin liquids in frustrated magnets journal, March 2010

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

Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials journal, March 2016

Fermionic response from fractionalization in an insulating two-dimensional magnet journal, July 2016

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

Theory of triplon dynamics in the quantum magnet BiCu 2 PO 6 journal, June 2016

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

Two-Phonon Resonances and Hybridization of the Resonance with Single-Phonon States journal, August 1970

Quantum phase transition in Heisenberg-Kitaev model journal, December 2012

Unconventional magnetic order on the hyperhoneycomb Kitaev lattice in β − Li 2 IrO 3 : Full solution via magnetic resonant x-ray diffraction journal, November 2014

Kitaev interactions between j = 1/2 moments in honeycomb Na 2 IrO 3 are large and ferromagnetic: insights from ab initio quantum chemistry calculations journal, January 2014

Field-induced decays in XXZ triangular-lattice antiferromagnets journal, October 2016

Correlated electrons in high-temperature superconductors journal, July 1994

Colloquium : Spontaneous magnon decays journal, January 2013

Unified theory of spiral magnetism in the harmonic-honeycomb iridates α , β , and γ Li 2 IrO 3 journal, June 2015

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

Magnetic anisotropy in the Kitaev model systems Na 2 IrO 3 and RuCl 3 journal, August 2016

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

Magnon Decay in Noncollinear Quantum Antiferromagnets journal, November 2006

An iteration method for the solution of the eigenvalue problem of linear differential and integral operators journal, October 1950

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

Dynamical structure factor of the triangular-lattice antiferromagnet journal, September 2013

Raman spectroscopic signature of fractionalized excitations in the harmonic-honeycomb iridates β- and γ-Li2IrO3 journal, July 2016

Experimental Realization of a 2D Fractional Quantum Spin Liquid journal, February 2001

Linear spin wave theory for single-Q incommensurate magnetic structures journal, March 2015

Dynamics of fractionalization in quantum spin liquids journal, September 2015

Dynamics of an Antiferromagnet at Low Temperatures: Spin-Wave Damping and Hydrodynamics journal, February 1971

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

Magnetic excitation spectrum of Na 2 IrO 3 probed with resonant inelastic x-ray scattering journal, June 2013

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

Hidden symmetries of the extended Kitaev-Heisenberg model: Implications for the honeycomb-lattice iridates A 2 IrO 3 journal, July 2015

Scattering factors computed from relativistic Dirac–Slater wave functions
journal, January 1965

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

Spin liquids in frustrated magnets
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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

Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials
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Fermionic response from fractionalization in an insulating two-dimensional magnet
journal, July 2016

Magnetic order in $α - {RuCl}_{3}$ : A honeycomb-lattice quantum magnet with strong spin-orbit coupling
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Theory of triplon dynamics in the quantum magnet ${BiCu}_{2} {PO}_{6}$
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Neutron scattering in the proximate quantum spin liquid α-RuCl ₃
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Two-Phonon Resonances and Hybridization of the Resonance with Single-Phonon States
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Quantum phase transition in Heisenberg-Kitaev model
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Unconventional magnetic order on the hyperhoneycomb Kitaev lattice in $β − {Li}_{2} {IrO}_{3}$ : Full solution via magnetic resonant x-ray diffraction
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Kitaev interactions between j = 1/2 moments in honeycomb Na ₂ IrO ₃ are large and ferromagnetic: insights from ab initio quantum chemistry calculations
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Field-induced decays in XXZ triangular-lattice antiferromagnets
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Correlated electrons in high-temperature superconductors
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Colloquium : Spontaneous magnon decays
journal, January 2013

Unified theory of spiral magnetism in the harmonic-honeycomb iridates $α, β$ , and $γ {Li}_{2} {IrO}_{3}$
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Noncoplanar and Counterrotating Incommensurate Magnetic Order Stabilized by Kitaev Interactions in $γ − {Li}_{2} {IrO}_{3}$
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Magnetic anisotropy in the Kitaev model systems ${Na}_{2} {IrO}_{3}$ and ${RuCl}_{3}$
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Scattering Continuum and Possible Fractionalized Excitations in $α − {RuCl}_{3}$
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Magnon Decay in Noncollinear Quantum Antiferromagnets
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An iteration method for the solution of the eigenvalue problem of linear differential and integral operators
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Fractionalized excitations in the spin-liquid state of a kagome-lattice antiferromagnet
journal, December 2012

Dynamical structure factor of the triangular-lattice antiferromagnet
journal, September 2013

Raman spectroscopic signature of fractionalized excitations in the harmonic-honeycomb iridates β- and γ-Li2IrO3
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Experimental Realization of a 2D Fractional Quantum Spin Liquid
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Linear spin wave theory for single-Q incommensurate magnetic structures
journal, March 2015

Dynamics of fractionalization in quantum spin liquids
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Dynamics of an Antiferromagnet at Low Temperatures: Spin-Wave Damping and Hydrodynamics
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Kitaev-Heisenberg Model on a Honeycomb Lattice: Possible Exotic Phases in Iridium Oxides $A_{2} {IrO}_{3}$
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Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3
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Hidden symmetries of the extended Kitaev-Heisenberg model: Implications for the honeycomb-lattice iridates $A_{2} {IrO}_{3}$
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