稀土钙钛矿氧化物中的量子磁性与自旋弛豫研究

稀土钙钛矿氧化物由于其丰富的磁电、磁光以及磁热等效应一直是凝聚态物理研究的重点。本项目申请人通过前期对稀土钙钛矿氧化物DyScO3的极低温磁性研究发现其中的镝离子不仅具有与同家族一维自旋链YbAlO3类似的低维量子磁性，同时又有着与单分子磁体相似的慢自旋弛豫行为。因此本项目关于DyScO3的研究可以为低维量子磁体和自旋电子学器件的相关研究架起一座新的桥梁。此外，通过对材料晶体场和基态波函数计算，我们发现在无机的稀土钙钛矿氧化物家族中可能存在着更多的被忽略的量子磁性以及慢自旋弛豫现象。不同于传统的有机-无机杂化的单分子磁体材料，大部分的稀土钙钛矿氧化物性质稳定，单晶生长工艺成熟，可以方便地集成到各种器件表面。因此本项目关于稀土钙钛矿材料的量子磁性以及自旋弛豫效应研究也将会为开拓新型量子自旋电子学器件提供一个全新的平台。

The rare-earth Perovskite have attracted continued attention in condensed matter physics due to the great variety of interesting properties, such as the magnetoelectric, magneto-optical and magnetocaloric effect. Based on our previous low-temperature magnetism study in DyScO3, we found this compound showed strong quantum fluctuations in the field induced magnetic phase region, similar with the recently reported isostructural low-dimensional quantum magnet YbAlO3. In addition, DyScO3 also exhibited slow spin relaxation behavior which was similar with single molecule magnets. Moreover, by calculating the crystal field and ground state, we found the quantum fluctuations and slow spin relaxation effects may also exist in more inorganic rare-earth perovskite materials. Different from the slow relaxation found in traditional single molecular magnets, these perovskite compounds are usually inert to air, easy to synthesize in different forms and the crystal structure naturally adapts to existing standard perovskite thin film substrates. Exploring the exotic spin dynamics in DyScO3 and related perovskite materials would provide a novel platform for material engineering of the quantum spintronic systems in future.