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.
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)
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)。
