Fundamental understanding of electronic transitions in platinum group metals and alloys from high-pressure experiment and ab initio theory

物质在极端条件下的行为令人着迷。压缩引起物质性质的质的改变，例如结构和磁性相变，从铁磁性到超导性的转变，形成物质的新的超态，以及其他现象。 该项目的最终目标是通过外部和激光加热DAC（和dsDAC）中的原位粉末和单晶X射线衍射结合先进的理论模拟，研究铂族金属（PGMs）及其合金在200 GPa及以上的压力下的相关系，结构和热弹性性能。我们将在铂族金属及其合金的高压行为中建立一个新的研究方法，重点是电子跃迁的检测，包括一个新的压力诱导的芯能级交叉跃迁。

The behavior of matter at extreme conditions is fascinating. Compression gives rise to a qualitative modification of properties of matter, such as structural and magnetic phase transitions, transformation from ferromagnetism to superconductivity, forming new super-states of matter, and other phenomena. The ultimate goal of the project is to study the phase relations, structures, and thermoelastic properties of platinum group metals (PGMs) and their alloys at multimegabar pressure, 200 GPa and above, and variable temperatures by means of in situ powder and single crystal X-ray diffraction in externally and laser heated DACs (and dsDACs) combined with advanced theoretical simulations. We will establish regularities in the high-pressure behavior of PGMs and their alloys with focus on the detection of electronic transitions, including a novel pressure induced core-level crossing transition.