Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate Na2IrO3

Sarkar, R.; Mei, Z.; Ruiz, A.; Lopez, G.; Klauss, H. -H.; Analytis, J. G.; Kimchi, I.; Curro, N. J.

doi:10.1103/PhysRevB.101.081101

Title: Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate ${Na}_{2} {IrO}_{3}$

Abstract

Kitaev's honeycomb spin-liquid model and its proposed realization in materials such as α-RuCl₃, Li ₂IrO₃, and Na₂IrO₃ continue to present open questions about how the dynamics of a spin liquid are modified in the presence of non-Kitaev interactions as well as the presence of inhomogeneities. Here we use ²³Na nuclear magnetic resonance to probe both static and dynamical magnetic properties in single-crystal Na₂IrO₃ . We find that the NMR shift follows the bulk susceptibility above 30 K but deviates from it below; moreover below T_N the spectra show a broad distribution of internal magnetic fields. Both of these results provide evidence for inequivalent magnetic sites at low temperature, suggesting inhomogeneities are important for the magnetism. The spin-lattice relaxation rate is isotropic and diverges at T_N, suggesting that the Kitaev cubic axes may control the critical quantum spin fluctuations. Finally, in the ordered state, we observe gapless excitations, which may arise from site substitution, emergent defects from milder disorder, or possibly be associated with nearby quantum paramagnetic states distinct from the Kitaev spin liquid.

Authors:

^[1]; Mei, Z. ^[2]; Ruiz, A. ^[3]; Lopez, G. ^[3];

^[1]; Analytis, J. G. ^[3]; Kimchi, I. ^[4];

^[2]

Technical Univ. of Dresden, Dresden (Germany). Inst. of Solid State and Materials Physics
Univ. of California, Davis, CA (United States). Dept. of Physics
Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States). JILA

Publication Date:: Mon Feb 03 00:00:00 EST 2020

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); National Science Foundation (NSF)

OSTI Identifier:: 1616111

Grant/Contract Number:: AC02-05CH11231; DMR-1506961; DMR-1807889

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 101; Journal Issue: 8; 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


                    Sarkar, R., Mei, Z., Ruiz, A., Lopez, G., Klauss, H. -H., Analytis, J. G., Kimchi, I., and Curro, N. J. Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate Na2IrO3.  United States: N. p., 2020. 
Web.  doi:10.1103/PhysRevB.101.081101.

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                    Sarkar, R., Mei, Z., Ruiz, A., Lopez, G., Klauss, H. -H., Analytis, J. G., Kimchi, I., & Curro, N. J. Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate Na2IrO3.  United States.  https://doi.org/10.1103/PhysRevB.101.081101

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                    Sarkar, R., Mei, Z., Ruiz, A., Lopez, G., Klauss, H. -H., Analytis, J. G., Kimchi, I., and Curro, N. J. Mon .  
"Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate Na2IrO3".  United States.  https://doi.org/10.1103/PhysRevB.101.081101.  https://www.osti.gov/servlets/purl/1616111.

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@article{osti_1616111,

  title        = {Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate Na2IrO3},

  author       = {Sarkar, R. and Mei, Z. and Ruiz, A. and Lopez, G. and Klauss, H. -H. and Analytis, J. G. and Kimchi, I. and Curro, N. J.},

  abstractNote = {Kitaev's honeycomb spin-liquid model and its proposed realization in materials such as α-RuCl3, Li 2IrO3, and Na2IrO3 continue to present open questions about how the dynamics of a spin liquid are modified in the presence of non-Kitaev interactions as well as the presence of inhomogeneities. Here we use 23Na nuclear magnetic resonance to probe both static and dynamical magnetic properties in single-crystal Na2IrO3 . We find that the NMR shift follows the bulk susceptibility above 30 K but deviates from it below; moreover below TN the spectra show a broad distribution of internal magnetic fields. Both of these results provide evidence for inequivalent magnetic sites at low temperature, suggesting inhomogeneities are important for the magnetism. The spin-lattice relaxation rate is isotropic and diverges at TN, suggesting that the Kitaev cubic axes may control the critical quantum spin fluctuations. Finally, in the ordered state, we observe gapless excitations, which may arise from site substitution, emergent defects from milder disorder, or possibly be associated with nearby quantum paramagnetic states distinct from the Kitaev spin liquid.},

  doi          = {10.1103/PhysRevB.101.081101},

  journal      = {Physical Review B},

  number       = 8,

  volume       = 101,

  place        = {United States},

  year         = {Mon Feb 03 00:00:00 EST 2020},

  month        = {Mon Feb 03 00:00:00 EST 2020}

}

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Title: Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate Na 2 IrO 3

Abstract

Citation Formats

Zigzag Magnetic Order in the Iridium Oxide Na 2 IrO 3 journal, February 2013

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

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

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

Anisotropic temperature-field phase diagram of single crystalline β − Li 2 IrO 3 : Magnetization, specific heat, and Li 7 NMR study journal, July 2019

Physics of the Kitaev Model: Fractionalization, Dynamic Correlations, and Material Connections journal, March 2018

Na 2 IrO 3 as a Novel Relativistic Mott Insulator with a 340-meV Gap journal, December 2012

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na 2 IrO 3 journal, September 2018

Nuclear magnetic resonance in the heavy fermion superconductors journal, January 2009

The Effect of Electron-Electron Interaction on the Nuclear Spin Relaxation in Metals journal, April 1963

Local magnetic inhomogeneities in Ba ( Fe 1 − x Ni x ) 2 As 2 as seen via A 75 s NMR journal, October 2010

Local magnetism and spin dynamics of the frustrated honeycomb rhodate Li 2 RhO 3 journal, September 2017

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

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

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

Nuclear magnetic resonance Knight shifts in the presence of strong spin–orbit and crystal-field potentials journal, July 2016

Gapless Spin Excitations in the Field-Induced Quantum Spin Liquid Phase of α − RuCl 3 journal, December 2017

Magnetic order and spin dynamics in La 2 O 2 Fe 2 OSe 2 probed by Fe 57 Mössbauer, La 139 NMR, and muon-spin relaxation spectroscopy journal, November 2014

A spin–orbital-entangled quantum liquid on a honeycomb lattice journal, February 2018

Scaling and data collapse from local moments in frustrated disordered quantum spin systems journal, October 2018

Direct evidence of a zigzag spin-chain structure in the honeycomb lattice: A neutron and x-ray diffraction investigation of single-crystal Na 2 IrO 3 journal, May 2012

Nuclear Spin-Lattice Relaxation in Magnetic Insulators journal, February 1968

Dynamics of fractionalization in quantum spin liquids journal, September 2015

Kitaev matter journal, May 2015

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

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

Valence Bonds in Random Quantum Magnets: Theory and Application to YbMgGaO 4 journal, July 2018

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

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

Physics of the Kitaev model: fractionalization, dynamical correlations, and material connections text, January 2018

Low-energy Spin Dynamics of the Honeycomb Spin Liquid Beyond the Kitaev Limit text, January 2016

Scaling and data collapse from local moments in frustrated disordered quantum spin systems text, January 2018

Title: Impact of disorder on dynamics and ordering in the honeycomb-lattice iridate ${Na}_{2} {IrO}_{3}$

Zigzag Magnetic Order in the Iridium Oxide ${Na}_{2} {IrO}_{3}$
journal, February 2013

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

Dynamics of a Two-Dimensional Quantum Spin Liquid: Signatures of Emergent Majorana Fermions and Fluxes
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Observation of two types of fractional excitation in the Kitaev honeycomb magnet
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Anisotropic temperature-field phase diagram of single crystalline $β - {Li}_{2} {IrO}_{3}$ : Magnetization, specific heat, and ${}^{7}{Li}$ NMR study
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Physics of the Kitaev Model: Fractionalization, Dynamic Correlations, and Material Connections
journal, March 2018

${Na}_{2} {IrO}_{3}$ as a Novel Relativistic Mott Insulator with a 340-meV Gap
journal, December 2012

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material ${Na}_{2} {IrO}_{3}$
journal, September 2018

Nuclear magnetic resonance in the heavy fermion superconductors
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The Effect of Electron-Electron Interaction on the Nuclear Spin Relaxation in Metals
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Local magnetic inhomogeneities in $Ba {({Fe}_{1 - x} {Ni}_{x})}_{2} {As}_{2}$ as seen via ${}^{75}A s$ NMR
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Low-Energy Spin Dynamics of the Honeycomb Spin Liquid Beyond the Kitaev Limit
journal, July 2016

Nuclear magnetic resonance Knight shifts in the presence of strong spin–orbit and crystal-field potentials
journal, July 2016

Gapless Spin Excitations in the Field-Induced Quantum Spin Liquid Phase of $α − {RuCl}_{3}$
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Magnetic order and spin dynamics in ${La}_{2} O_{2} {Fe}_{2} {OSe}_{2}$ probed by ${}^{57}{Fe}$ Mössbauer, ${}^{139}{La}$ NMR, and muon-spin relaxation spectroscopy
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A spin–orbital-entangled quantum liquid on a honeycomb lattice
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Scaling and data collapse from local moments in frustrated disordered quantum spin systems
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Nuclear Spin-Lattice Relaxation in Magnetic Insulators
journal, February 1968

Dynamics of fractionalization in quantum spin liquids
journal, September 2015

Kitaev matter
journal, May 2015

Observation of two types of fractional excitation in the Kitaev honeycomb magnet
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