Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80)

Zhao, Hengdi; Hu, Bing; Ye, Feng; Lee, Minhyea; Schlottmann, Pedro; Cao, Gang

doi:10.1103/physrevb.104.l041108

Title: Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate Na_xIrO₃ (0.60 ≤ x ≤ 0.80)

Abstract

Here, we report the results of our study of a recently synthesized honeycomb iridate Na_xIrO₃ (0.60 ≤ x ≤ 0.80). Single-crystal Na_xIrO₃ adopts a honeycomb lattice noticeably without distortions and stacking disorder inherently existent in its sister compound Na₂IrO₃. The oxidation state of the Ir ion is a mixed valence state resulting from a majority Ir⁵⁺(5d⁴) ion and a minority Ir⁶⁺(5d³) ion. Na_xIrO₃ is a Mott insulator likely with a predominant pseudospin =1 state. It exhibits an effective moment of 1.1 μB/Ir and a Curie-Weiss temperature of –19 K but with no discernible long-range order above 1 K. The physical behavior below 1 K features two prominent anomalies at T_h = 0.9 K and T_l = 0.12 K in both the heat capacity and AC magnetic susceptibility. Intermediate between T_h and T_l lies a pronounced temperature linearity of the heat capacity with a large slope of 77 mJ /mole K², a feature expected for highly correlated metals but not at all for insulators. These results along with a comparison drawn with the honeycomb lattices Na₂IrO₃ and (Na_0.2Li_0.8)₂IrO₃ point to an exotic ground state in proximity to a possible Kitaev spin liquid.

Authors:

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Univ. of Colorado, Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States); North China Electric Power Univ., Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Florida State Univ., Tallahassee, FL (United States)

Publication Date:: Tue Jul 20 00:00:00 EDT 2021

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1817382

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 104; Journal Issue: 4; 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; Quantum spin liquid; Honeycomb lattice; Iridates; Kitaev model

Citation Formats


                    Zhao, Hengdi, Hu, Bing, Ye, Feng, Lee, Minhyea, Schlottmann, Pedro, and Cao, Gang. Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80).  United States: N. p., 2021. 
Web.  doi:10.1103/physrevb.104.l041108.

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                    Zhao, Hengdi, Hu, Bing, Ye, Feng, Lee, Minhyea, Schlottmann, Pedro, & Cao, Gang. Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80).  United States.  https://doi.org/10.1103/physrevb.104.l041108

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                    Zhao, Hengdi, Hu, Bing, Ye, Feng, Lee, Minhyea, Schlottmann, Pedro, and Cao, Gang. Tue .  
"Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80)".  United States.  https://doi.org/10.1103/physrevb.104.l041108.  https://www.osti.gov/servlets/purl/1817382.

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@article{osti_1817382,

  title        = {Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80)},

  author       = {Zhao, Hengdi and Hu, Bing and Ye, Feng and Lee, Minhyea and Schlottmann, Pedro and Cao, Gang},

  abstractNote = {Here, we report the results of our study of a recently synthesized honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80). Single-crystal NaxIrO3 adopts a honeycomb lattice noticeably without distortions and stacking disorder inherently existent in its sister compound Na2IrO3. The oxidation state of the Ir ion is a mixed valence state resulting from a majority Ir5+(5d4) ion and a minority Ir6+(5d3) ion. NaxIrO3 is a Mott insulator likely with a predominant pseudospin =1 state. It exhibits an effective moment of 1.1 μB/Ir and a Curie-Weiss temperature of –19 K but with no discernible long-range order above 1 K. The physical behavior below 1 K features two prominent anomalies at Th = 0.9 K and Tl = 0.12 K in both the heat capacity and AC magnetic susceptibility. Intermediate between Th and Tl lies a pronounced temperature linearity of the heat capacity with a large slope of 77 mJ /mole K2, a feature expected for highly correlated metals but not at all for insulators. These results along with a comparison drawn with the honeycomb lattices Na2IrO3 and (Na0.2Li0.8)2IrO3 point to an exotic ground state in proximity to a possible Kitaev spin liquid.},

  doi          = {10.1103/physrevb.104.l041108},

  journal      = {Physical Review B},

  number       = 4,

  volume       = 104,

  place        = {United States},

  year         = {Tue Jul 20 00:00:00 EDT 2021},

  month        = {Tue Jul 20 00:00:00 EDT 2021}

}

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Title: Ground state in proximity to a possible Kitaev spin liquid: The undistorted honeycomb iridate NaxIrO3 (0.60 ≤ x ≤ 0.80)

Abstract

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

Novel Magnetism of ${Ir}^{5 +} (5 d^{4})$ Ions in the Double Perovskite ${Sr}_{2} {YIrO}_{6}$
journal, February 2014

Evolution of magnetism in the single-crystal honeycomb iridates $({Na}_{1 - x}$ Li $_{x})_{2} Ir O_{3}$
journal, December 2013

Lattice-tuned magnetism of ${Ru}^{4 +} (4 d^{4})$ ions in single crystals of the layered honeycomb ruthenates ${Li}_{2} {RuO}_{3}$ and ${Na}_{2} {RuO}_{3}$
journal, October 2014

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

Effect of isoelectronic doping on the honeycomb-lattice iridate $A_{2}$ ${IrO}_{3}$
journal, June 2014

Crystal structure refinement with SHELXL
journal, January 2015

Magnetic and non-magnetic phases of a quantum spin liquid
journal, March 2011

VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data
journal, October 2011

Competition between spin-orbit coupling, magnetism, and dimerization in the honeycomb iridates: $α - {Li}_{2} {IrO}_{3}$ under pressure
journal, January 2018

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

Critical Properties of the Kitaev-Heisenberg Model
journal, November 2012

Evidence for a low-temperature magnetic ground state in double-perovskite iridates with $I r^{5 +} (5 d^{4})$ ions
journal, August 2017

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

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

Crystal structure and elementary properties of ${Na}_{x} Co O_{2}$ ( $x = 0.32$ , 0.51, 0.6, 0.75, and 0.92) in the three-layer $Na Co O_{2}$ family
journal, May 2006

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

The challenge of spin–orbit-tuned ground states in iridates: a key issues review
journal, February 2018

Kitaev-Heisenberg Model on a Honeycomb Lattice: Possible Exotic Phases in Iridium Oxides $A_{2} {IrO}_{3}$
journal, July 2010

Kitaev matter
journal, May 2015

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

Thermodynamic Evidence of Proximity to a Kitaev Spin Liquid in ${Ag}_{3} {LiIr}_{2} O_{6}$
journal, December 2019

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

Long-range magnetic ordering in Na $_{2}$ IrO $_{3}$
journal, June 2011

Thermal fractionalization of quantum spins in a Kitaev model: Temperature-linear specific heat and coherent transport of Majorana fermions
journal, September 2015

Clues and criteria for designing a Kitaev spin liquid revealed by thermal and spin excitations of the honeycomb iridate ${Na}_{2} {IrO}_{3}$
journal, May 2016

Low-temperature crystal and magnetic structure of $α - {RuCl}_{3}$
journal, April 2016