高温量子磁性拓扑材料中自旋调控与中子散射研究

探索具有高温量子反常霍尔效应的材料，对发展新一代芯片，突破量子极限具有重要意义。实现这种量子材料需要设计非平庸的拓扑电子结构和构造高温稳定的磁有序，特别是把控材料中的“磁”。依托中国绵阳研究堆（China Mianyang Research Reactor, CMRR）的中子科学平台，我们将聚焦一类新的高温拓扑磁性材料—— RMn6Sn6（R为f电子稀土元素)。其磁有序温度高于室温，锰原子构成Kagome晶格。非Kagome晶格稀土元素的f电子对体系磁性拓扑态有重要影响。我们以中子散射的手段直接表征体系的磁结构、磁性态，结合量子输运、材料制备等手段研究“f电子磁性对拓扑电子态的影响”、“如何构造干净的面外磁矩的Kagome晶格磁体”、“如何调控磁并诱导高温量子化的电磁平台”等科学问题，开拓高温量子反常霍尔效应的新材料体系。

Achieving high-temperature(HT) quantum anomalous hall effect (QAHE) is of great importance for developing new generation electronic chips to break through the quantum limit. It is indicated that the nontrivial topological electron structure and HT robust magnetism are necessary for the materials with HT QAHE, especially for magnetism. With the neutron scattering technique（China Mianyang Research Reactor (CMRR) ）we focus on a kind of HT Kagome magnet RMn6Sn6 (where R is the rare earth materials). These materials exhibit Kagome lattice and intrinsic magnetic order above room temperature. The magnetism from the f state of rare earth element (f-RE) strongly couples with the magnetic Kagome layer (MKY). We will study the magnetic structure and state by neutron scattering technique which will help us to understand “the interaction between f-RE and MKY”, “How to construct the ‘clean’ magnetism in Kagome lattice?”, and “how to achieve HT QAHE” etc. The research will open a new material platform for HT QAHE.