论文标题
金属有机框架中铁电和磁性的磁共振探测
Magnetic resonance probing of ferroelectricity and magnetism in metal-organic frameworks
论文作者
论文摘要
我们采用自旋探针MN2+的电子顺磁共振（EPR）来研究DMAMNF和MN2掺杂的DMZNF中的副型铁电跃迁，它们被认为是模型的金属有机框架（MOF），具有PB FreePerovskite perovskite架构。在DMAMNF中，我们研究了X波段（9.4 GHz）和80至300 K的MN2+ EPR线形状和强度的变化，并且我们显示了铁电过渡时缺乏磁电耦合。在DMMNF中的抗铁磁过渡时，我们检测到AFM相中由弱铁磁磁性引起的磁电耦合。在DMZNF中，MN2+探针和DFT的EPR的组合表明晶体场主要由DMA+阳离子确定。
We employ electron paramagnetic resonance (EPR) of the spin probe Mn2+ to study the paraelectric ferroelectric transition in DMAMnF and Mn2 doped DMZnF, which are considered to be model metal organic frameworks (MOF) with a Pb free perovskite architecture. In DMAMnF, we study the variation of the Mn2+ EPR line shape and intensity at the X-band (9.4 GHz) and over 80 to 300 K, and we show the absence of magnetoelectric coupling at the ferroelectric transition. At the antiferromagnetic transition in DMMnF, we detect a magnetoelectric coupling caused by weak ferromagnetism in the AFM phase. In DMZnF, the combination of EPR of the Mn2+ probe and DFT show that the crystal field is predominantly determined by the DMA+ cations.
