Xiao T T, Ouyang Z W, Liu X C, Cao J J, Wang Z X, Tong W
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
J Phys Condens Matter. 2022 May 11;34(27). doi: 10.1088/1361-648X/ac69a0.
We report angular dependence of spin-flop transition in triangular lattice antiferromagnet Cu(OH)Br by angle-dependent magnetization and ESR measurements. The results show that the antiferromagnetic easy magnetization axis is the diagonal direction (= 45°) of theplane, i.e., the orientation of Cu1 spins based on the magnetic structure (2020037204), whereas the spin-flop axis is theaxis. A phenomenological model is proposed to describe the angle-dependent spin-flop transitions. Based on this model, Cu1 spins are sensitive to external magnetic field, while Cu2 spins are robust against to the field, showing partial decoupling. The model is expected to be used in other uniaxial antiferromagnets with a more general easy axis and complex spin-flop transitions.
我们通过角度相关的磁化和电子自旋共振测量，报告了三角晶格反铁磁体Cu(OH)Br中自旋翻转转变的角度依赖性。结果表明，反铁磁易磁化轴是平面的对角线方向（= 45°），即基于磁结构（2020037204）的Cu1自旋的取向，而自旋翻转轴是轴。提出了一个唯象模型来描述角度相关的自旋翻转转变。基于该模型，Cu1自旋对外部磁场敏感，而Cu2自旋对磁场具有抗性，表现出部分解耦。该模型有望用于其他具有更一般易轴和复杂自旋翻转转变的单轴反铁磁体。
