Strong spin frustration and magnetism in kagome antiferromagnets LnCu3(OH)6Br3 (Ln = Nd, Sm, and Eu)

被引:1
|
作者
Zhong, Jin-Qun [1 ]
Yu, Zhen-Wei [1 ]
Yue, Xiao-Yu [6 ]
Wang, Yi-Yan [2 ]
Liang, Hui [2 ]
Sun, Yan [2 ]
Wu, Dan-Dan [2 ]
Ding, Zong-Ling [5 ]
Sun, Jin [5 ]
Sun, Xue-Feng [3 ,4 ]
Li, Qiu-Ju [5 ]
机构
[1] Anhui Univ, Sch Mat Sci & Engn, Hefei 230601, Peoples R China
[2] Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China
[3] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China
[4] Univ Sci & Technol China, Key Lab Strongly Coupled Quantum Matter Phys CAS, Hefei 230026, Peoples R China
[5] Anhui Univ, Sch Phys & Optoelect Engn, Hefei 230601, Peoples R China
[6] Suzhou City Univ, Sch Opt & Elect Informat, Suzhou 215104, Peoples R China
基金
中国国家自然科学基金;
关键词
kagome lattice; antiferromagnet; single crystal; spin frustration; LIQUID GROUND-STATE; NEGATIVE MAGNETIZATION; LATTICES;
D O I
10.1088/1674-1056/acb9e8
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
To study the effects of lanthanide ions on the geometrically frustrated antiferromagnets and their magnetic properties, we grew high-quality single crystals of LnCu(3)(OH)(6)Br-3 (Ln = Nd, Sm, and Eu) by hydrothermal method and studied their crystal structures and magnetic properties. The refinements of the crystal structure referred to the powder x-ray diffraction data show that LnCu(3)(OH)(6)Br-3 adopt a Kapellasite-type layer structure, which is isostructural to their chlorine analogue. Magnetic susceptibilities demonstrate that LnCu(3)(OH)(6)Br-3 have strong antiferromagnetic coupling and a pronounced magnetic frustration effect. Magnetization measurements indicate canted antiferromagnetic ordering of Cu2+ ions around 16 K within the kagome plane and weak ferromagnetic coupling. Moreover, shoulder-like anomalies in specific heat around 16 K could be a signature of emergent of magnetic ordering. The low-temperature negative magnetization and specific heat of LnCu(3)(OH)(6)Br-3 (Ln = Nd, Sm, and Eu) indicate that Ln (3+) ions induce more exotic magnetic ground state properties.
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页数:6
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