Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices

Liurukara D. Sanjeewa; V. Ovidiu Garlea; Michael A. McGuire; Colin D. McMillen; Joseph W. Kolis

doi:10.1021/acs.inorgchem.8b03418

Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices

Liurukara D. Sanjeewa, V. Ovidiu Garlea, Michael A. McGuire, Colin D. McMillen, Joseph W. Kolis

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

16 Scopus citations

Abstract

The magnetic properties are reported for three members of the glaserite series of compounds, Na ₂ BaM(VO ₄ ) ₂ , M = Mn, Mn _0.6 Co _0.4 , and Co. Large single crystals are grown using a high-temperature hydrothermal synthesis method. This structure type exhibits a triangular magnetic lattice in which M ²⁺ O ₆ octahedra are interconnected with nonmagnetic (VO ₄ ) ^3- groups. All the structures crystallize at room temperature with rigid trigonal symmetry (space group P3Ìm1); however, at lower temperatures both Na ₂ BaMn(VO ₄ ) ₂ and Na ₂ BaMn _0.6 Co _0.4 (VO ₄ ) ₂ undergo a structural transition to lower symmetry (monoclinic, C2/c). The bulk magnetic measurements indicate that Mn- A nd Co-structures are antiferromagnetic and ferromagnetic, respectively. Na ₂ BaMn _0.6 Co _0.4 (VO ₄ ) ₂ does not show any long-range ordering down to 0.5 K, although a broad heat capacity anomaly near 1.2 K suggests short-range magnetic order or freezing into a spin-glass-like state related to the chemical disorder and resulting competing magnetic interactions. The magnetic structures of Na ₂ BaMn(VO ₄ ) ₂ and Na ₂ BaCo(VO ₄ ) ₂ were determined using neutron powder diffraction. At zero magnetic field, Na ₂ BaMn(VO ₄ ) ₂ possesses an antiferromagnetic structure with the moments ordered in a Neél-type arrangement and aligned along the C ₄ axis of the octahedra. Under applied magnetic field at 0.3 K, the evolution of the magnetic structure toward a fully polarized state is observed. Na ₂ BaCo(VO ₄ ) ₂ represents a ferromagnetic (FM) magnetic structure with Co moments aligned parallel to the c-axis direction. The relationships between these structures and magnetic properties are discussed.

Original language	English
Pages (from-to)	2813-2821
Number of pages	9
Journal	Inorganic Chemistry
Volume	58
Issue number	4
DOIs	https://doi.org/10.1021/acs.inorgchem.8b03418
State	Published - Feb 18 2019
Externally published	Yes

Funding

The authors thank the National Science Foundation Grant No. DMR-1410727 for financial support. Work at the Oak Ridge National Laboratory, was sponsored by the Scientific User Facilities Division (neutron diffraction) and Materials Sciences and Engineering Division (magnetization measurements), Office of Basic Energy Sciences, U.S. Department of Energy (DOE).

Funders	Funder number
National Science Foundation	1808371, DMR-1410727
U.S. Department of Energy
Basic Energy Sciences
Division of Materials Sciences and Engineering

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10.1021/acs.inorgchem.8b03418

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@article{5239f986b1174901a004b02689962c03,

title = "Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices",

abstract = " The magnetic properties are reported for three members of the glaserite series of compounds, Na 2 BaM(VO 4 ) 2 , M = Mn, Mn 0.6 Co 0.4 , and Co. Large single crystals are grown using a high-temperature hydrothermal synthesis method. This structure type exhibits a triangular magnetic lattice in which M 2+ O 6 octahedra are interconnected with nonmagnetic (VO 4 ) 3- groups. All the structures crystallize at room temperature with rigid trigonal symmetry (space group P3{\`I}m1); however, at lower temperatures both Na 2 BaMn(VO 4 ) 2 and Na 2 BaMn 0.6 Co 0.4 (VO 4 ) 2 undergo a structural transition to lower symmetry (monoclinic, C2/c). The bulk magnetic measurements indicate that Mn- A nd Co-structures are antiferromagnetic and ferromagnetic, respectively. Na 2 BaMn 0.6 Co 0.4 (VO 4 ) 2 does not show any long-range ordering down to 0.5 K, although a broad heat capacity anomaly near 1.2 K suggests short-range magnetic order or freezing into a spin-glass-like state related to the chemical disorder and resulting competing magnetic interactions. The magnetic structures of Na 2 BaMn(VO 4 ) 2 and Na 2 BaCo(VO 4 ) 2 were determined using neutron powder diffraction. At zero magnetic field, Na 2 BaMn(VO 4 ) 2 possesses an antiferromagnetic structure with the moments ordered in a Ne{\'e}l-type arrangement and aligned along the C 4 axis of the octahedra. Under applied magnetic field at 0.3 K, the evolution of the magnetic structure toward a fully polarized state is observed. Na 2 BaCo(VO 4 ) 2 represents a ferromagnetic (FM) magnetic structure with Co moments aligned parallel to the c-axis direction. The relationships between these structures and magnetic properties are discussed.",

author = "Sanjeewa, {Liurukara D.} and Garlea, {V. Ovidiu} and McGuire, {Michael A.} and McMillen, {Colin D.} and Kolis, {Joseph W.}",

note = "Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

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doi = "10.1021/acs.inorgchem.8b03418",

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T1 - Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices

AU - Sanjeewa, Liurukara D.

AU - Garlea, V. Ovidiu

AU - McGuire, Michael A.

AU - McMillen, Colin D.

AU - Kolis, Joseph W.

PY - 2019/2/18

Y1 - 2019/2/18

N2 - The magnetic properties are reported for three members of the glaserite series of compounds, Na 2 BaM(VO 4 ) 2 , M = Mn, Mn 0.6 Co 0.4 , and Co. Large single crystals are grown using a high-temperature hydrothermal synthesis method. This structure type exhibits a triangular magnetic lattice in which M 2+ O 6 octahedra are interconnected with nonmagnetic (VO 4 ) 3- groups. All the structures crystallize at room temperature with rigid trigonal symmetry (space group P3Ìm1); however, at lower temperatures both Na 2 BaMn(VO 4 ) 2 and Na 2 BaMn 0.6 Co 0.4 (VO 4 ) 2 undergo a structural transition to lower symmetry (monoclinic, C2/c). The bulk magnetic measurements indicate that Mn- A nd Co-structures are antiferromagnetic and ferromagnetic, respectively. Na 2 BaMn 0.6 Co 0.4 (VO 4 ) 2 does not show any long-range ordering down to 0.5 K, although a broad heat capacity anomaly near 1.2 K suggests short-range magnetic order or freezing into a spin-glass-like state related to the chemical disorder and resulting competing magnetic interactions. The magnetic structures of Na 2 BaMn(VO 4 ) 2 and Na 2 BaCo(VO 4 ) 2 were determined using neutron powder diffraction. At zero magnetic field, Na 2 BaMn(VO 4 ) 2 possesses an antiferromagnetic structure with the moments ordered in a Neél-type arrangement and aligned along the C 4 axis of the octahedra. Under applied magnetic field at 0.3 K, the evolution of the magnetic structure toward a fully polarized state is observed. Na 2 BaCo(VO 4 ) 2 represents a ferromagnetic (FM) magnetic structure with Co moments aligned parallel to the c-axis direction. The relationships between these structures and magnetic properties are discussed.

AB - The magnetic properties are reported for three members of the glaserite series of compounds, Na 2 BaM(VO 4 ) 2 , M = Mn, Mn 0.6 Co 0.4 , and Co. Large single crystals are grown using a high-temperature hydrothermal synthesis method. This structure type exhibits a triangular magnetic lattice in which M 2+ O 6 octahedra are interconnected with nonmagnetic (VO 4 ) 3- groups. All the structures crystallize at room temperature with rigid trigonal symmetry (space group P3Ìm1); however, at lower temperatures both Na 2 BaMn(VO 4 ) 2 and Na 2 BaMn 0.6 Co 0.4 (VO 4 ) 2 undergo a structural transition to lower symmetry (monoclinic, C2/c). The bulk magnetic measurements indicate that Mn- A nd Co-structures are antiferromagnetic and ferromagnetic, respectively. Na 2 BaMn 0.6 Co 0.4 (VO 4 ) 2 does not show any long-range ordering down to 0.5 K, although a broad heat capacity anomaly near 1.2 K suggests short-range magnetic order or freezing into a spin-glass-like state related to the chemical disorder and resulting competing magnetic interactions. The magnetic structures of Na 2 BaMn(VO 4 ) 2 and Na 2 BaCo(VO 4 ) 2 were determined using neutron powder diffraction. At zero magnetic field, Na 2 BaMn(VO 4 ) 2 possesses an antiferromagnetic structure with the moments ordered in a Neél-type arrangement and aligned along the C 4 axis of the octahedra. Under applied magnetic field at 0.3 K, the evolution of the magnetic structure toward a fully polarized state is observed. Na 2 BaCo(VO 4 ) 2 represents a ferromagnetic (FM) magnetic structure with Co moments aligned parallel to the c-axis direction. The relationships between these structures and magnetic properties are discussed.

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DO - 10.1021/acs.inorgchem.8b03418

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SN - 0020-1669

VL - 58

SP - 2813

EP - 2821

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 4

ER -

Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices

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