A new layered kagome strip structure Na2Co3(AsO4)2(OH)2: static and dynamic magnetic properties

Duminda S. Liurukara; Emily D. Williams; Tianran Chen; Stuart Calder; V. Ovidiu Garlea; C. Charlotte Buchanan; Dustin A. Gilbert; Joseph W. Kolis; D. A. Tennant

doi:10.1039/d5qm00922g

A new layered kagome strip structure Na₂Co₃(AsO₄)₂(OH)₂: static and dynamic magnetic properties

Duminda S. Liurukara
, Emily D. Williams
, Tianran Chen
, Stuart Calder
, V. Ovidiu Garlea
, C. Charlotte Buchanan
, Dustin A. Gilbert
, Joseph W. Kolis
, D. A. Tennant

Research output: Contribution to journal › Article › peer-review

Abstract

One-dimensional kagome strip chains share much of the same frustrated structural motif as two-dimensional kagome antiferromagnets, making them valuable for deepening our understanding of kagome lattice magnetism. In this paper, we report the hydrothermal synthesis and detailed structural and property characterization of Na₂Co₃(AsO₄)₂(OH)₂, a striped kagome system. The crystal structure was characterized using single crystal X-ray diffraction which reveals that Na₂Co₃(AsO₄)₂(OH)₂ crystallizes in monoclinic crystal system C2/m. The structure features a one-dimensional kagome strip lattice built from Co²⁺ ions and undergoes an antiferromagnetic transition at T_N = 14 K. The magnetic ground state at zero field was characterized using neutron powder diffraction. Below the magnetic transition, Na₂Co₃(AsO₄)₂(OH)₂ orders into an antiferromagnetic structure with a k-vector (0.5, 0.5, 0.5). In the proposed model, the Co1 moment is predominantly confined to the ac-plane while the Co2 moment is primarily aligned along the b-axis. Two flat bands were observed in the inelastic neutron spectra below the magnetic transition, 5 and 10 meV. Inelastic neutron spectra were modeled with a Heisenberg Hamiltonian including three nearest-neighbor exchange interactions (J₁, J₂, J₃) and strong single-ion anisotropy to stabilize the observed magnetic structure. Our study highlights the complexity of Co²⁺-based kagome strip magnetic lattice compound Na₂Co₃(AsO₄)₂(OH)₂ which provides an excellent platform to broaden our understanding of the frustrated kagome magnetic lattice space.

Original language	English
Pages (from-to)	971-982
Number of pages	12
Journal	Materials Chemistry Frontiers
Volume	10
Issue number	6
DOIs	https://doi.org/10.1039/d5qm00922g
State	Published - Mar 16 2026

Funding

The research at the Oak Ridge National Laboratory (ORNL) is supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Materials Sciences and Engineering Division. This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, DOE Office of Science User Facilities operated by ORNL. The beam time was allocated to HB-2A (POWDER) and HYSPEC (BL14B) on proposal numbers IPTS-32168 and 33656.] The synthesis, crystal growth and X-ray diffraction were supported by NSF award DMR – 2219129. Magnetic measurements taken at the University of Tennessee were supported by the DOE Early Career Program, Award DE-SC0021344. This manuscript has been coauthored by employees of ORNL, which is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy (DOE). The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevo-cable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan.62

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10.1039/d5qm00922g

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@article{5874282cd6e54b8b834e490f5b679dc1,

title = "A new layered kagome strip structure Na2Co3(AsO4)2(OH)2: static and dynamic magnetic properties",

abstract = "One-dimensional kagome strip chains share much of the same frustrated structural motif as two-dimensional kagome antiferromagnets, making them valuable for deepening our understanding of kagome lattice magnetism. In this paper, we report the hydrothermal synthesis and detailed structural and property characterization of Na2Co3(AsO4)2(OH)2, a striped kagome system. The crystal structure was characterized using single crystal X-ray diffraction which reveals that Na2Co3(AsO4)2(OH)2 crystallizes in monoclinic crystal system C2/m. The structure features a one-dimensional kagome strip lattice built from Co2+ ions and undergoes an antiferromagnetic transition at TN = 14 K. The magnetic ground state at zero field was characterized using neutron powder diffraction. Below the magnetic transition, Na2Co3(AsO4)2(OH)2 orders into an antiferromagnetic structure with a k-vector (0.5, 0.5, 0.5). In the proposed model, the Co1 moment is predominantly confined to the ac-plane while the Co2 moment is primarily aligned along the b-axis. Two flat bands were observed in the inelastic neutron spectra below the magnetic transition, 5 and 10 meV. Inelastic neutron spectra were modeled with a Heisenberg Hamiltonian including three nearest-neighbor exchange interactions (J1, J2, J3) and strong single-ion anisotropy to stabilize the observed magnetic structure. Our study highlights the complexity of Co2+-based kagome strip magnetic lattice compound Na2Co3(AsO4)2(OH)2 which provides an excellent platform to broaden our understanding of the frustrated kagome magnetic lattice space.",

author = "Liurukara, \{Duminda S.\} and Williams, \{Emily D.\} and Tianran Chen and Stuart Calder and Garlea, \{V. Ovidiu\} and Buchanan, \{C. Charlotte\} and Gilbert, \{Dustin A.\} and Kolis, \{Joseph W.\} and Tennant, \{D. A.\}",

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doi = "10.1039/d5qm00922g",

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T1 - A new layered kagome strip structure Na2Co3(AsO4)2(OH)2

T2 - static and dynamic magnetic properties

AU - Liurukara, Duminda S.

AU - Williams, Emily D.

AU - Chen, Tianran

AU - Calder, Stuart

AU - Garlea, V. Ovidiu

AU - Buchanan, C. Charlotte

AU - Gilbert, Dustin A.

AU - Kolis, Joseph W.

AU - Tennant, D. A.

PY - 2026/3/16

Y1 - 2026/3/16

N2 - One-dimensional kagome strip chains share much of the same frustrated structural motif as two-dimensional kagome antiferromagnets, making them valuable for deepening our understanding of kagome lattice magnetism. In this paper, we report the hydrothermal synthesis and detailed structural and property characterization of Na2Co3(AsO4)2(OH)2, a striped kagome system. The crystal structure was characterized using single crystal X-ray diffraction which reveals that Na2Co3(AsO4)2(OH)2 crystallizes in monoclinic crystal system C2/m. The structure features a one-dimensional kagome strip lattice built from Co2+ ions and undergoes an antiferromagnetic transition at TN = 14 K. The magnetic ground state at zero field was characterized using neutron powder diffraction. Below the magnetic transition, Na2Co3(AsO4)2(OH)2 orders into an antiferromagnetic structure with a k-vector (0.5, 0.5, 0.5). In the proposed model, the Co1 moment is predominantly confined to the ac-plane while the Co2 moment is primarily aligned along the b-axis. Two flat bands were observed in the inelastic neutron spectra below the magnetic transition, 5 and 10 meV. Inelastic neutron spectra were modeled with a Heisenberg Hamiltonian including three nearest-neighbor exchange interactions (J1, J2, J3) and strong single-ion anisotropy to stabilize the observed magnetic structure. Our study highlights the complexity of Co2+-based kagome strip magnetic lattice compound Na2Co3(AsO4)2(OH)2 which provides an excellent platform to broaden our understanding of the frustrated kagome magnetic lattice space.

AB - One-dimensional kagome strip chains share much of the same frustrated structural motif as two-dimensional kagome antiferromagnets, making them valuable for deepening our understanding of kagome lattice magnetism. In this paper, we report the hydrothermal synthesis and detailed structural and property characterization of Na2Co3(AsO4)2(OH)2, a striped kagome system. The crystal structure was characterized using single crystal X-ray diffraction which reveals that Na2Co3(AsO4)2(OH)2 crystallizes in monoclinic crystal system C2/m. The structure features a one-dimensional kagome strip lattice built from Co2+ ions and undergoes an antiferromagnetic transition at TN = 14 K. The magnetic ground state at zero field was characterized using neutron powder diffraction. Below the magnetic transition, Na2Co3(AsO4)2(OH)2 orders into an antiferromagnetic structure with a k-vector (0.5, 0.5, 0.5). In the proposed model, the Co1 moment is predominantly confined to the ac-plane while the Co2 moment is primarily aligned along the b-axis. Two flat bands were observed in the inelastic neutron spectra below the magnetic transition, 5 and 10 meV. Inelastic neutron spectra were modeled with a Heisenberg Hamiltonian including three nearest-neighbor exchange interactions (J1, J2, J3) and strong single-ion anisotropy to stabilize the observed magnetic structure. Our study highlights the complexity of Co2+-based kagome strip magnetic lattice compound Na2Co3(AsO4)2(OH)2 which provides an excellent platform to broaden our understanding of the frustrated kagome magnetic lattice space.

UR - https://www.scopus.com/pages/publications/105029183435

U2 - 10.1039/d5qm00922g

DO - 10.1039/d5qm00922g

M3 - Article

AN - SCOPUS:105029183435

SN - 2052-1537

VL - 10

SP - 971

EP - 982

JO - Materials Chemistry Frontiers

JF - Materials Chemistry Frontiers

IS - 6

ER -

A new layered kagome strip structure Na₂Co₃(AsO₄)₂(OH)₂: static and dynamic magnetic properties

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