Investigations of novel physical properties in multi-layered compounds

在过去的几十年里，人们对许多层状化合物进行了研究，因为它们显示了各种有趣的物理性质。在这项研究中，我研究了两个系列的层状化合物体系，以寻找新的物理性质。首先，我研究了铁基超导体中的硫系FeTe1-xSex，并阐明了其磁涨落的细节。其次，通过对SrCo2P2及其系列化合物的物理性质的研究，发现了一个巡回的电子-变磁相变，并发现该体系通过在Ca位替代锶而表现出量子临界行为，这些结果对于系统地理解准二维层状化合物的巡回磁性是有价值的。

In the past several decades, many layered compounds have been investigated because they show a variety of interesting physical properties. In this study, I investigated two series of layered compound systems to search for novel physical properties. First, I investigated Chalcogenide-system FeTe1-xSex which is one of the Fe-based superconductors, and clarified details of their magnetic fluctuations. Next, from investigations of physical properties of SrCo2P2 and its family compounds, I discovered an itinerant electron- metamagnetic transition and found that the system shows a quantum critical behavior by substitution of Sr at Ca site.These results are worthy for the systematic understanding of the itinerant magnetism on the quasi two dimensional layered compounds.