论文标题
压力引起的Jarosite磁性崩溃
Pressure induced collapse of magnetic order in jarosite
论文作者
论文摘要
我们报告了〜45 GPA的沮丧的Kagomé材料jarosite中压力诱导的相变，这导致磁顺序消失。使用一套实验技术，我们表征了通过此相变的jarosite中的结构，电子和磁变化。同步粉末X射线衍射和傅立叶变换红外光谱实验，通过密度功能理论计算的结果进行了分析，表明材料从R-3M结构变为具有R-3C空间组的结构。结果阶段具有罕见的扭曲的Kagomé晶格，其中等边Fe3+三角形的完整性持续存在。基于对称参数，我们假设所得的结构变化改变了磁相互作用，以利用高压下可能的量子顺磁性相。
We report a pressure-induced phase transition in the frustrated kagomé material jarosite at ~45 GPa, which leads to the disappearance of magnetic order. Using a suite of experimental techniques, we characterize the structural, electronic, and magnetic changes in jarosite through this phase transition. Synchrotron powder X-ray diffraction and Fourier transform infrared spectroscopy experiments, analyzed in aggregate with the results from density functional theory calculations, indicate that the material changes from a R-3m structure to a structure with a R-3c space group. The resulting phase features a rare twisted kagomé lattice in which the integrity of the equilateral Fe3+ triangles persists. Based on symmetry arguments we hypothesize that the resulting structural changes alter the magnetic interactions to favor a possible quantum paramagnetic phase at high pressure.
