论文标题
高压阶段的结构分析，用于天际托管多效CU2OSEO3
Structure analysis of high-pressure phase for skyrmion-hosting multiferroic Cu2OSeO3
论文作者
论文摘要
Cu2oseo3被称为具有Skyrmion自旋纹理绝缘多性化合物的独特例子，其特征是在环境压力下手性立方晶体结构。最近，据报道，该化合物显示出压力诱导的结构过渡，并大量增强磁性有序温度TC。在本研究中，我们通过将同步加速器X射线衍射实验与钻石砧细胞和基于遗传算法的分析相结合，研究了高压阶段中详细的晶体结构。我们的结果表明，即使在结构过渡之后，原始的pyrochlore Cu网络也可以持续，而SEO3分子的方向以及氧气在Cu Tetrahedra中间的位置得到了显着修饰。后者的特征可能是报告增强TC和在室温下Skyrmion相的稳定的关键。
Cu2OSeO3 is known as a unique example of insulating multiferroic compounds with skyrmion spin texture, which is characterized by the chiral cubic crystal structure at ambient pressure. Recently, it has been reported that this compound shows pressure-induced structural transition with large enhancement of magnetic ordering temperature Tc. In the present study, we have investigated the detailed crystal structure in the high pressure phase, by combining the synchrotron X-ray diffraction experiment with the diamond anvil cell and the analysis based on the genetic algorithm. Our results suggest that the original pyrochlore Cu network is sustained even after the structural transition, while the orientation of SeO3 molecule as well as the position of oxygen in the middle of Cu tetrahedra are significantly modified. The latter features may be the key for the reported enhancement of Tc and associated stabilization of skyrmion phase at room temperature.
