Antiferromagnetic Order and Possible Quantum Spin Liquid in Kagome Antiferromagnet LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)]  

作　　者：Zezhong Li Lankun Han Yili Sun Shanshan Zhang Zhenyuan Zeng Shiliang Li 李泽众;韩岚琨;孙毅丽;张珊珊;曾振源;李世亮(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics Letters》2025年第2期255-259,共5页中国物理快报(英文版)

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2022YFA1403400 and 2021YFA1400400);Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant Nos.XDB33000000 and GJTD-2020-01)。

摘　　要：Recent studies on the kagome lattice YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br)have provided promising evidence for the existence of Dirac quantum spin liquids.In this study,we synthesized a new compound,LuCu_(3)(OH)_(6)Br_(2)[Br_(x)(OH)_(1-x)],which has two types of structures with two different space groups,P3m1 and R3.The type-Ⅰ sample with a space group of P3m1 had undistorted Cu^(2+)kagome planes and orders magnetically below approximately 1.5 K.The type-Ⅱ sample had a larger unit cell with a space group of R3 and distorted kagome planes.No magnetic ordering was observed,and the low-temperature specific heat behaved like a Dirac quantum spin liquid,including a quadratic temperature dependence at zero field and an additional linear𝑇term under magnetic fields.By comparing the structures with those of YCu_(3)(OH)_(6+x)X_(3-x)(X=Cl,Br),we show that the quantum spin liquid ground state may have a deep connection with the𝐽J■-J-J′Heisenberg model in the kagome lattice.

关 键 词：distorted x) QUANTUM 

分 类 号：O41[理学—理论物理]