Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice

Zhong, Ruidan; Guo, Shu; Xu, Guangyong; Xu, Zhijun; Cava, Robert J.

doi:10.1073/pnas.1906483116

Title: Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice

Abstract

Currently under active study in condensed matter physics, both theoretically and experimentally, are quantum spin liquid (QSL) states, in which no long-range magnetic ordering appears at low temperatures due to strong quantum fluctuations of the magnetic moments. The existing QSL candidates all have their intrinsic disadvantages, however, and solid evidence for quantum fluctuations is scarce. Here, we report a previously unreported compound, Na2BaCo(PO4)2, a geometrically frustrated system with effective spin-1/2 local moments for Co2+ ions on an isotropic 2-dimensional (2D) triangular lattice. Magnetic susceptibility and neutron scattering experiments show no magnetic ordering down to 0.05 K. Thermodynamic measurements show that there is a tremendous amount of magnetic entropy present below 1 K in 0-applied magnetic field. The presence of localized low-energy spin fluctuations is revealed by inelastic neutron measurements. At low applied fields, these spin excitations are confined to low energy and contribute to the anomalously large specific heat. In larger applied fields, the system reverts to normal behavior as evident by both neutron and thermodynamic results. Our experimental characterization thus reveals that this material is an excellent candidate for the experimental realization of a QSL state.

Authors:: Zhong, Ruidan; Guo, Shu; Xu, Guangyong; Xu, Zhijun; Cava, Robert J.

Publication Date:: 2019-07-02

Research Org.:: Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Org.:: USDOE Office of Science (SC); National Institute of Standards and Technology; US Department of Commerce; Gordon and Betty Moore Emergent Phenomena in Quantum System (EPiQS) Program

OSTI Identifier:: 1564522

Alternate Identifier(s):: OSTI ID: 1613182; OSTI ID: 1825715

Grant/Contract Number:: SC0019331; GBMF-4412

Resource Type:: Published Article

Journal Name:: Proceedings of the National Academy of Sciences of the United States of America

Additional Journal Information:: Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 29; Journal ID: ISSN 0027-8424

Publisher:: National Academy of Sciences

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; science & technology - other topics; quantum spin liquids; geometric frustrated magnets; quantum fluctuation; triangular lattice

Citation Formats


                    Zhong, Ruidan, Guo, Shu, Xu, Guangyong, Xu, Zhijun, and Cava, Robert J. Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice.  United States: N. p., 2019. 
Web.  doi:10.1073/pnas.1906483116.

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                    Zhong, Ruidan, Guo, Shu, Xu, Guangyong, Xu, Zhijun, & Cava, Robert J. Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice.  United States.  https://doi.org/10.1073/pnas.1906483116

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                    Zhong, Ruidan, Guo, Shu, Xu, Guangyong, Xu, Zhijun, and Cava, Robert J. Tue .  
"Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice".  United States.  https://doi.org/10.1073/pnas.1906483116.

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@article{osti_1564522,

  title        = {Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice},

  author       = {Zhong, Ruidan and Guo, Shu and Xu, Guangyong and Xu, Zhijun and Cava, Robert J.},

  abstractNote = {Currently under active study in condensed matter physics, both theoretically and experimentally, are quantum spin liquid (QSL) states, in which no long-range magnetic ordering appears at low temperatures due to strong quantum fluctuations of the magnetic moments. The existing QSL candidates all have their intrinsic disadvantages, however, and solid evidence for quantum fluctuations is scarce. Here, we report a previously unreported compound, Na2BaCo(PO4)2, a geometrically frustrated system with effective spin-1/2 local moments for Co2+ ions on an isotropic 2-dimensional (2D) triangular lattice. Magnetic susceptibility and neutron scattering experiments show no magnetic ordering down to 0.05 K. Thermodynamic measurements show that there is a tremendous amount of magnetic entropy present below 1 K in 0-applied magnetic field. The presence of localized low-energy spin fluctuations is revealed by inelastic neutron measurements. At low applied fields, these spin excitations are confined to low energy and contribute to the anomalously large specific heat. In larger applied fields, the system reverts to normal behavior as evident by both neutron and thermodynamic results. Our experimental characterization thus reveals that this material is an excellent candidate for the experimental realization of a QSL state.},

  doi          = {10.1073/pnas.1906483116},

  journal      = {Proceedings of the National Academy of Sciences of the United States of America},

  number       = 29,

  volume       = 116,

  place        = {United States},

  year         = {2019},

  month        = {7}

}

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Title: Strong quantum fluctuations in a quantum spin liquid candidate with a Co-based triangular lattice

Abstract

Citation Formats

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

Spin-Glass Ground State in a Triangular-Lattice Compound YbZnGaO 4 journal, February 2018

Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt journal, April 2008

Geometrical frustration journal, February 2006

Disorder-Induced Mimicry of a Spin Liquid in YbMgGaO 4 journal, October 2017

Fractionalized excitations in the partially magnetized spin liquid candidate YbMgGaO4 journal, October 2018

Field-induced spin-liquid-like state in a magnetic honeycomb lattice journal, December 2018

Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate journal, December 2016

Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO4 journal, November 2015

Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9 journal, August 2017

Quantum spin liquids journal, November 2000

Highly Mobile Gapless Excitations in a Two-Dimensional Candidate Quantum Spin Liquid journal, June 2010

Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4 journal, December 2016

Synthesis and magnetic properties of a new series of triangular-lattice magnets, Na 2 BaMV 2 O 8 (M = Ni, Co, and Mn) journal, February 2013

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Screw - Type Motion and Its Impact on Cooperativity in BaNa 2 Fe[VO 4 ] 2 journal, May 2018

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Specific Heat of Antimony and Bismuth between 0.03 and 0.8 K journal, April 1970

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Experimental Realization of a Spin- 1 / 2 Triangular-Lattice Heisenberg Antiferromagnet journal, January 2012

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Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
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Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt
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Disorder-Induced Mimicry of a Spin Liquid in ${YbMgGaO}_{4}$
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Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate
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Single-crystal structure validation with the program PLATON
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Experimental Realization of a Spin- $1 / 2$ Triangular-Lattice Heisenberg Antiferromagnet
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Site Specific X-ray Anomalous Dispersion of the Geometrically Frustrated Kagomé Magnet, Herbertsmithite, ZnCu ₃ (OH) ₆ Cl ₂
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