溶剂热法FeSe基超导材料制备和物性研究

项目名称： 溶剂热法FeSe基超导材料制备和物性研究

项目编号： No.51472266

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 金士锋

作者单位： 中国科学院物理研究所

项目金额： 86万元

中文摘要： 铁基超导体是近年发现的重要的高温超导材料。相对于铁砷基超导体，铁硒基超导体具有新奇的物理性质，但其材料种类和优质样品的稀缺严重限制了相关研究进展。特别当物性层FeSe与碱金属K等载流子库层结合时，该类高温超导材料在250 C左右会发生微观相分离。近期，由我们提出的液氨插层等室温或更低温度下的合成方法很好的克服了该问题。但低温插层方法仍存在溶剂选择单一，样品结晶性不高等新问题，限制了所获得超导材料的种类和样品质量。本项目以室温至250 C温区内新型FeSe基超导体的探索为研究目标，利用溶剂热方法在该温区内广泛的溶剂、溶质选择以及低温制备亚稳相单晶体的独特优势，探索和制备出无微观相分离且具有较高晶体质量的新型超导材料，为FeSe基高温超导体的研究提供更为理想的实验载体。进而系统研究其结构物性，深入揭示该类铁基超导材料的超导机理。

中文关键词： 铁基超导材料；人工晶体；晶体生长；晶体结构调控；物性调控

英文摘要： The iron-based superconductors are the recently discovered high-temperature superconducting materials. Among them, the FeSe-based superconductors have attracted considerable attention because of their novel physical properties, however,the rarity of the material types and the lack of high quality samples hindered the more in-depth study. Especially,the FeSe based superconductors with charge carrier layer (for example, potassium atom layer) exist microscopic phase separation above 250 C. Recently, we developed a low-temperature liquid ammonia routine that lead to a new series of FeSe-based intercalating superconductors, which succesfully resolved this dilemma. To overcome the limitation of solvent and intercalating agents in the low temperature intercalation routine and especially to improve the crystallinity of samples, our project intent to develop new FeSe based superconductors and attempt to growth their single crystals based on solvothermal method below 250 C. Based on our extensive experiences in the new superconductor preparation and crystal growth, our project intent to provide a more ideal experimental platform for the FeSe-based high Tc superconductor investigations, and reveal the superconducting mechanism of such materials.

英文关键词： Iron Superconducting Materials;Synthetic Crystals;Crystal growth;Crystal Structure Engineering;Properties Engineering