项目名称： 强磁场下非常规超导体的核磁共振研究

项目编号： No.U1532145

项目类型： 联合基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 吴涛

作者单位： 中国科学技术大学

项目金额： 70万元

中文摘要： 在超导体研究中，强磁场是一种调控超导态的有效手段，可以揭示隐藏在超导态之下的“正常态”或“竞争态”等相关物理特性，是进行超导机理研究的重要手段之一。非常规超导体是一类新型的超导材料，它与传统超导材料相比具有许多反常的物理特性，其超导机理到目前仍然没有完全认识清楚，是该领域公认的难点问题。该申请项目将依托于中科院强磁场科学中心实验平台，拟建立一套在强磁场下适用于凝聚态物理研究（特别是关联电子材料）的低温核磁共振探头，并在此基础上开展强磁场下非常规超导体的核磁共振研究。本项目将针对铜氧化合物高温超导体和铁基高温超导体中磁场诱导的低温“正常态”和竞争相进行核磁共振研究，试图通过测量核磁共振波谱、奈特位移和自旋-晶格弛豫率等物理量对磁场的依赖关系，对磁场诱导的“正常态”和竞争相进行系统表征。通过本项目，我们将理解“正常态”的形成机制和竞争相与超导的关系。

中文关键词： 高温超导；核磁共振；强磁场

英文摘要： In superconductor research, high-magnetic field is one kind of method to modulate superconducting state. It could be used to unfold the normal state or competing state which is hidden by superconducting state and is one of important methods to study the mechanism of superconductivity. Unconventional superconductor is a new kind of superconducting materials. Compared with conventional superconductor, it has a lot of anomal physical properties and its superconducting mechanism is not completely clear up to now which is still an open question in this field. This project relys on Hefei high magnetic field lab and we plan to build up a low-temperature probe which is suitable for research on condensed matter physics，especially for strongly correlated electonic materials. Based on this, we will conduct nuclear magnetic resonance study on unconventional superconductor under high magnetic field. This project will be concentrated on NMR study of the magnetic-field induced normal state and competing order in both high-Tc cuprates and pnictides. Through measuring the field dependence of NMR spectrum, knight shift and spin-lattice relaxation, we could systematically characterize the magnetic field induced normal state and competing order. Finally, we will try to understand the mechanism of normal state and the correlation between competing order and superconductivity.

英文关键词： high-Tc superconductors;NMR;high magnetic field