Metal Organic Frameworks (MOFs) are a group of multiferroic candidates that exhibit various optical, electrical, magnetic, and structural properties depending on the type of organic cations, transition metals and halogen elements, and their molar ratio. (C 6 H 5 CH 2 NH 3 ) 2 [CuCl 4 ] (BZACC), one of the MOF materials, has a special hybrid layered structure of organic and inorganic layers. Magnetic property measurement showed that BZACC exhibits weak in-plane ferromagnetism below the Curie point ( T C ) of 10.25 K and the saturated magnetic moment of 1 µ B per formula unit at 2 K. When the magnetic field is less than 0.1 T along the c axis, it exhibits weak antiferromagnetism below 8 K. From the measurement of the dielectric constant with external magnetic field, we observed a maximum magnetodielectric (MD) effect of 0.4% at 2 K. Furthermore, it was found that the magnetic-field dependence of the MD effect is similar to that of the second derivative of magnetization with respect to magnetic field. We suggest that the observed MD effect is the consequence of the magnetic-field-induced spin structure change in the inorganic layer, which induces the change in the interlayer magnetic coupling and, as a result, induces the change in the dielectric constant by the applied magnetic field.

中文翻译：

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(C6H5CH2NH3)2[CuCl4] 具有有机-无机混合层状结构的磁性和磁介电效应

金属有机骨架 (MOF) 是一组多铁性候选物，根据有机阳离子、过渡金属和卤素元素的类型及其摩尔比，表现出各种光学、电学、磁学和结构特性。(C 6 H 5 CH 2 NH 3 ) 2 [CuCl 4 ] (BZACC)是MOF材料之一，具有有机层和无机层的特殊混合层状结构。磁性能测量表明，BZACC 在居里点 (TC) 10.25 K 以下表现出微弱的面内铁磁性，在 2 K 时每个公式单位的饱和磁矩为 1 µ B。当沿 c 方向的磁场小于 0.1 T 时轴，它在 8 K 以下表现出微弱的反铁磁性。从外部磁场的介电常数测量中，我们观察到在 2 K 时的最大磁介电 (MD) 效应为 0.4%。此外，发现 MD 效应的磁场依赖性类似于磁化强度对磁场的二阶导数的依赖性。我们认为观察到的 MD 效应是无机层中磁场引起的自旋结构变化的结果，它引起了层间磁耦合的变化，结果引起了介电常数的变化。磁场。