High-performance Fe-based superconducting materials for high magnetic field applications

高磁场磁体是医学诊断和材料特性表征的重要工具，在许多研究领域是不可或缺的。提供达到技术可行性极限的最高磁场是出色的基础和应用研究的关键先决条件。超导材料是产生强磁场的关键因素，到目前为止，经典超导体NbTi和NbSn3将可用的磁场强度限制在21 t左右。除了铜基高温超导体外，最近发现的铁基超导体可能会将可达到的磁场上限转移到更高的值。拟议的项目将通过结合卡尔斯鲁厄理工学院（KIT）和中国科学院（CAS）在物理，材料科学和工程领域的专业知识，开发和测试世界上第一个铁基超导高磁场插入线圈。KIT技术物理研究所（ITEP）的研究小组将以其材料专业知识为这一目标做出贡献，并将研究和改进高磁场下的超导临界电流特性。电气工程研究所（IE-CAS）的研究小组将开发和合成高jc导线，用于实现超导高场插入线圈。

High-field magnets are important tools for medical diagnostics as well as the characterization of material properties and are indispensable for many research areas. Providing highest magnetic fields up to technical feasibility limits is a crucial prerequisite for outstanding basic and applied research. Superconducting materials are the key ingredient for generating strong magnetic fields, and so far the classic superconductors NbTi and NbSn3 limit the available magnetic field strength to about 21 T. Besides the cuprate-based high-temperature superconductors, the recently discovered Fe-based superconductors might open the possibility to shift the accessible upper field limit to much higher values. The proposed project will address this target to develop and test the worldwide first Fe-based superconducting high magnetic field insert coil by combining the expertise of Karlsruhe Institute of Technology (KIT) and the Chinese Academy of Sciences (CAS) in the fields of physics, materials sciences, and engineering. The research group at the Institute for Technical Physics (ITEP) at KIT will contribute to this goal with its material expertise and will study and improve the superconducting critical current properties in high magnetic fields. The research group at the Institute for Electrical Engineering (IE-CAS) will develop and synthesize high-Jc wires, which can be used to realize a superconducting high-field insert coil.