Magnetism study on a triangular lattice antiferromagnet Cu-2(OH)(3)Br
Magnetism study on a triangular lattice antiferromagnet Cu-2(OH)(3)Br
复制标题
三角晶格反铁磁体Cu-2(OH)(3)Br的磁性研究
DOI：
10.1088/1361-648x/ab1623
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
He Z Z
中科院分区：
文献类型：
--
作者：
Zhao Z Y;Che H L;Chen R;Wang J F;Sun X F;He Z Z
Magnetism of Cu2(OH)3Br single crystals based on a triangular lattice is studied by means of magnetic susceptibility, pulsed-field magnetization, and specific heat measurements. There are two inequivalent Cu2+ sites in an asymmetric unit. Both Cu2+ sublattices undergo a long-range antiferromagnetic (AFM) order at K. Upon cooling, an anisotropy crossover from Heisenberg to XY behavior is observed below 7.5 K from the anisotropic magnetic susceptibility. The magnetic field applied within the XY plane induces a spin-flop transition of Cu2+ ions between 4.9 T and 5.3 T. With further increasing fields, the magnetic moment is gradually increased but is only about half of the saturation of a Cu2+ ion even in 30 T. The individual reorientation of the inequivalent Cu2+ spins under field is proposed to account for the magnetization behavior. The observed spin-flop transition is likely related to one Cu site, and the AFM coupling among the rest Cu spins is so strong that the 30 T field cannot overcome the anisotropy. The temperature dependence of the magnetic specific heat, which is well described by a sum of two gapped AFM contributions, is a further support for the proposed scenario.
