铁基超导体的发现，开创了高温超导研究的新热潮，由于其超导电性邻近磁性不稳，所以研究母体的磁性起源对认识铁基超导电性的微观机制有着重要意义，而其母体化合物中的多种磁性关联还有待深入研究。本项目是在成功合成新型铁磷族化合物CuFeSb和CuFeAs的基础上，建立了新的FeAs体系CuFe(1-x)TMx(As,P)。利用自助溶剂法和外助溶剂法等方法生长高质量的单晶样品，通过表征其电磁性质，并采用中子散射实验和ARPES测量手段对体系的晶体结构和电子能带结构进行系统的研究，建立体系的相图，研究该体系中巡游铁磁产生的两种可能机制。在CuFe(1-x)TMx(As,P)同一体系中，通过过渡金属的掺杂，调节体系不同的磁性关联，从而揭示阴离子到铁平面的高度对体系铁磁和反铁磁关联相互竞争的影响，并通过研究磁性关联对外在调节因素的依赖关系，揭示铁磷族和铁硫族化合物中磁性起源。

The discovery of layered iron pnictide and iron chalcogenide superconductors has ushered in a new era of high-temperature superconductivity. In these materials superconductivity occurs in close proximity to a magnetic instability. So the study of the mechanism of magnetism in undoped parent compounds is clearly critical to our emerging understanding of iron-based superconductivity. However, the varying magnetic correlations in the parent compounds of iron pnictide and chalcogenide superconductors have not been fully understood. In this proposed research, we will focus on studying a group of new iron pnictides CuFe(1-x)TMx(As,P) which are based on two new iron pnictides, CuFeSb and CuFeAs, recently discovered by my group. We will grow high quality single crystals using the flux/self-flux method. We will perform systematic studies on crytal structure and electronic band structures for these doped systems via neutron scattering and ARPES measurements. With these measurements, we will establish the phase diagrams for the systems. A part of the research proposed below is to distinguish two mechanisms whether the itinerant ferromagnetism of the system arises from Stoner instability or the double-exchange ferromagnetic interaction. If the different magnetic states could be tuned in the same material system of CuFe(1-x)TMx(As,P) via chemical substitutions, the mechanism of the anion height controls the relative strength of these two magnetic correlations between the competing FM and AFM correlations might be easily revealed. We may examine the mechanism of magnetism in iron pnictides and chalcogenides through investigating essential tuning parameters for varying magnetic correlations.