铬基化合物A2Cr3As3（A =K，Rb，Cs）是最近发现的一种新材料，具有非常规超导电性。本项目将围绕A2Cr3As3体系，结合核磁共振、材料制备、输运测量等实验方法，研究A2Cr3As3的非常规超导电性和量子临界行为。我们将利用核磁共振方法研究A2Cr3As3非常规超导态的性质，探索超导配对对称性，特别是自旋三重态p波配对的可能性。利用元素掺杂或替代、磁场、温度等多种调控手段，拓展体系的电子相图，寻找体系的磁性母体。研究体系中铁磁性自旋涨落的性质，探索量子相变及其量子临界行为。通过这些研究，深入理解非常规超导电性和铁磁涨落的关系，最终为揭示超导机理提供线索。

Recently, chromium-based compounds A2Cr3As3 (A = K, Rb, Cs) were found to be unconventional superconductors. In this project, we propose to study unconventional superconductivity and quantum criticality of A2Cr3As3 by combining sample synthesis, transport measurements and NMR experiments. We will use NMR method to study the unconventional superconductivity, and explore the symmetry of superconducting pairing, especially the possibility of spin-triplet p-wave pairing. We plan to explore the electronic phase diagram and find the magnetic mother compound of A2Cr3As3 by controlling doping, magnetic field, temperature, etc. We will study the ferromagnetic spin fluctuations, quantum phase transition and the associated quantum critical behavior. Through these investigations, we aim to understand the relationship between unconventional superconductivity and the ferromagnetic spin fluctuations, and hint at the mechanism of superconductivity.