Doping-induced structural transformation in the spin-1/2 triangular-lattice antiferromagnet Na2Ba1-xSrxCo(PO4)2

Chuandi Zhang; Qianhui Xu; Xu Tao Zeng; Chao Lyu; Zhengwang Lin; Jiazheng Hao; Sihao Deng; Lunhua He; Yinguo Xiao; Yu Ye; Ziyu Chen; Xian Lei Sheng; Wentao Jin

doi:10.1016/j.jallcom.2022.164147

Doping-induced structural transformation in the spin-1/2 triangular-lattice antiferromagnet Na₂Ba_1-xSr_xCo(PO₄)₂

Chuandi Zhang
, Qianhui Xu
, Xu Tao Zeng
, Chao Lyu
, Zhengwang Lin
, Jiazheng Hao
, Sihao Deng
, Lunhua He^*
, Yinguo Xiao
, Yu Ye
, Ziyu Chen^*
, Xian Lei Sheng
, Wentao Jin

^*Corresponding author for this work

School of Physics

Beihang University
Peking University
Spallation Neutron Source Science Center
CAS - Institute of Physics
Songshan Lake Materials Laboratory

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

4 Scopus citations

Abstract

The effects of Sr doping on the structural properties of Na₂BaCo(PO₄)₂, a spin-1/2 triangular-lattice antiferromagnet as a quantum spin liquid candidate, are investigated by complementary x-ray and neutron powder diffraction measurements. It is found that in Na₂Ba_1−xSr_xCo(PO₄)₂ (NBSCPO), the trigonal phase (space group P3̅m1) with a perfect triangular lattice of Co²⁺ ions is structurally stable when the doping level of Sr is below 30% (x ≤ 0.3), while a pure monoclinic phase (space group P2₁/a) with slight rotations of CoO₆ octahedra and displacements of Ba²⁺/Sr²⁺ ions will be established when the Sr doping level is above 60% (x ≥ 0.6). Such a doping-induced structural transformation in NBSCPO is supported by first-principles calculations and Raman spectroscopy. Na₂SrCo(PO₄)₂, a novel spin-1/2 antiferromagnet with glaserite-type structure, although monoclinically distorted, exhibits no long-range magnetic order down to 2 K and a similar negative Curie-Weiss temperature as Na₂BaCo(PO₄)₂ with a perfect triangular lattice, suggesting the robustness of magnetic exchange interaction against the Ba/Sr substitutions.

Original language	English
Article number	164147
Journal	Journal of Alloys and Compounds
Volume	905
DOIs	https://doi.org/10.1016/j.jallcom.2022.164147
State	Published - 5 Apr 2022

Keywords

Doping effect
Frustrated magnetism
Neutron diffraction
Spin-1/2 antiferromagnet
Structural transformation
X-Ray diffraction

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10.1016/j.jallcom.2022.164147

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@article{ce99548eab99487d92bcec0b2a26def4,

title = "Doping-induced structural transformation in the spin-1/2 triangular-lattice antiferromagnet Na2Ba1-xSrxCo(PO4)2",

abstract = "The effects of Sr doping on the structural properties of Na2BaCo(PO4)2, a spin-1/2 triangular-lattice antiferromagnet as a quantum spin liquid candidate, are investigated by complementary x-ray and neutron powder diffraction measurements. It is found that in Na2Ba1−xSrxCo(PO4)2 (NBSCPO), the trigonal phase (space group P3̅m1) with a perfect triangular lattice of Co2+ ions is structurally stable when the doping level of Sr is below 30\% (x ≤ 0.3), while a pure monoclinic phase (space group P21/a) with slight rotations of CoO6 octahedra and displacements of Ba2+/Sr2+ ions will be established when the Sr doping level is above 60\% (x ≥ 0.6). Such a doping-induced structural transformation in NBSCPO is supported by first-principles calculations and Raman spectroscopy. Na2SrCo(PO4)2, a novel spin-1/2 antiferromagnet with glaserite-type structure, although monoclinically distorted, exhibits no long-range magnetic order down to 2 K and a similar negative Curie-Weiss temperature as Na2BaCo(PO4)2 with a perfect triangular lattice, suggesting the robustness of magnetic exchange interaction against the Ba/Sr substitutions.",

keywords = "Doping effect, Frustrated magnetism, Neutron diffraction, Spin-1/2 antiferromagnet, Structural transformation, X-Ray diffraction",

author = "Chuandi Zhang and Qianhui Xu and Zeng, \{Xu Tao\} and Chao Lyu and Zhengwang Lin and Jiazheng Hao and Sihao Deng and Lunhua He and Yinguo Xiao and Yu Ye and Ziyu Chen and Sheng, \{Xian Lei\} and Wentao Jin",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = apr,

day = "5",

doi = "10.1016/j.jallcom.2022.164147",

language = "英语",

volume = "905",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Doping-induced structural transformation in the spin-1/2 triangular-lattice antiferromagnet Na2Ba1-xSrxCo(PO4)2

AU - Zhang, Chuandi

AU - Xu, Qianhui

AU - Zeng, Xu Tao

AU - Lyu, Chao

AU - Lin, Zhengwang

AU - Hao, Jiazheng

AU - Deng, Sihao

AU - He, Lunhua

AU - Xiao, Yinguo

AU - Ye, Yu

AU - Chen, Ziyu

AU - Sheng, Xian Lei

AU - Jin, Wentao

PY - 2022/4/5

Y1 - 2022/4/5

N2 - The effects of Sr doping on the structural properties of Na2BaCo(PO4)2, a spin-1/2 triangular-lattice antiferromagnet as a quantum spin liquid candidate, are investigated by complementary x-ray and neutron powder diffraction measurements. It is found that in Na2Ba1−xSrxCo(PO4)2 (NBSCPO), the trigonal phase (space group P3̅m1) with a perfect triangular lattice of Co2+ ions is structurally stable when the doping level of Sr is below 30% (x ≤ 0.3), while a pure monoclinic phase (space group P21/a) with slight rotations of CoO6 octahedra and displacements of Ba2+/Sr2+ ions will be established when the Sr doping level is above 60% (x ≥ 0.6). Such a doping-induced structural transformation in NBSCPO is supported by first-principles calculations and Raman spectroscopy. Na2SrCo(PO4)2, a novel spin-1/2 antiferromagnet with glaserite-type structure, although monoclinically distorted, exhibits no long-range magnetic order down to 2 K and a similar negative Curie-Weiss temperature as Na2BaCo(PO4)2 with a perfect triangular lattice, suggesting the robustness of magnetic exchange interaction against the Ba/Sr substitutions.

AB - The effects of Sr doping on the structural properties of Na2BaCo(PO4)2, a spin-1/2 triangular-lattice antiferromagnet as a quantum spin liquid candidate, are investigated by complementary x-ray and neutron powder diffraction measurements. It is found that in Na2Ba1−xSrxCo(PO4)2 (NBSCPO), the trigonal phase (space group P3̅m1) with a perfect triangular lattice of Co2+ ions is structurally stable when the doping level of Sr is below 30% (x ≤ 0.3), while a pure monoclinic phase (space group P21/a) with slight rotations of CoO6 octahedra and displacements of Ba2+/Sr2+ ions will be established when the Sr doping level is above 60% (x ≥ 0.6). Such a doping-induced structural transformation in NBSCPO is supported by first-principles calculations and Raman spectroscopy. Na2SrCo(PO4)2, a novel spin-1/2 antiferromagnet with glaserite-type structure, although monoclinically distorted, exhibits no long-range magnetic order down to 2 K and a similar negative Curie-Weiss temperature as Na2BaCo(PO4)2 with a perfect triangular lattice, suggesting the robustness of magnetic exchange interaction against the Ba/Sr substitutions.

KW - Doping effect

KW - Frustrated magnetism

KW - Neutron diffraction

KW - Spin-1/2 antiferromagnet

KW - Structural transformation

KW - X-Ray diffraction

UR - https://www.scopus.com/pages/publications/85124481712

U2 - 10.1016/j.jallcom.2022.164147

DO - 10.1016/j.jallcom.2022.164147

M3 - 文章

AN - SCOPUS:85124481712

SN - 0925-8388

VL - 905

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 164147

ER -

Doping-induced structural transformation in the spin-1/2 triangular-lattice antiferromagnet Na₂Ba_1-xSr_xCo(PO₄)₂

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