Critical behavior in the layered organic–inorganic hybrid (CH3NH3)2CuCl4

• 来源期刊: 中国物理B（英文版）
• 关键词: critical behavior critical exponent organic-inorganic hybrid
• 年，卷（期）: 2020,（6）
• 页码范围: 558-565
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab892c

摘要

The critical properties and the nature of the ferromagnetic–paramagnetic phase transition in the 2D organic-inorganic hybrid (CH3NH3)2CuCl4 single crystal have been investigated by dc magnetization in the vicinity of the magnetic transi-tion. Different techniques were used to estimate the critical exponents near the ferromagnetic–paramagnetic phase transition such as modified Arrott plots, the Kouvel–Fisher method, and the scaling hypothesis. Values ofβ =0.22,γ=0.82, andδ =4.4 were obtained. These critical exponents are in line with their corresponding values confirmed through the scaling hypothesis as well as the Widom scaling relation, supporting their reliability. It is concluded that this 2D hybrid com-pound possesses strong ferromagnetic intra-layer exchange interaction as well as weak interlayer ferromagnetic coupling that causes a crossover from 2D to 3D long-range interaction.