Strong spin frustration and magnetism in kagoméantiferromagnets LnCu_(3)(OH)_(6)Br_(3)(Ln=Nd,Sm,and Eu)  

作　　者：钟金群 余振伟 岳小宇 王义炎 梁慧 孙燕 吴丹丹 丁宗玲 孙进 孙学峰 李秋菊 Jin-Qun Zhong;Zhen-Wei Yu;Xiao-Yu Yue;Yi-Yan Wang;Hui Liang;Yan Sun;Dan-Dan Wu;Zong-Ling Ding;Jin Sun;Xue-Feng Sun;Qiu-Ju Li(School of Materials Science and Engineering,Anhui University,Hefei 230601,China;Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Department of Physics,and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS),University of Science and Technology of China,Hefei 230026,China;School of Physics and Optoelectronic engineering,Anhui University,Hefei 230601,China;School of Optical and Electronic Information,Suzhou City University,Suzhou 215104,China)

机构地区：[1]School of Materials Science and Engineering,Anhui University,Hefei 230601,China [2]Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China [3]Department of Physics,and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS),University of Science and Technology of China,Hefei 230026,China [4]School of Physics and Optoelectronic engineering,Anhui University,Hefei 230601,China [5]School of Optical and Electronic Information,Suzhou City University,Suzhou 215104,China

出　　处：《Chinese Physics B》2023年第4期103-108,共6页中国物理B（英文版）

基　　金：Project supported by the Natural Science Foundation of Anhui Province,China(Grant Nos.2108085MA16 and2108085QA22);the Key Project of Anhui Provincial Department of Education(Grant No.KJ2020A0013);the Key Project of the Foundation of Anhui Education Committee,China(Grant No.2022AH050066);the National Natural Science Foundation of China(Grant Nos.U1832209,11874336,12274338,12104010,12104011,52102333,and 12004003)。

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 Cu^(2+)ions around 16 K within the kagoméplane 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.

关 键 词：kagomélattice ANTIFERROMAGNET single crystal spin frustration 

分 类 号：O469[理学—凝聚态物理]