Cr基和Mn基新超导体探索和及非常规超导电性研究

最近，项目申请人及合作者在CrAs和MnP中通过加压在量子临界点附近发现超导，这是Cr基和Mn基化合物的第一个超导体，其发现使得所有3d过渡族元素均具有超导的化合物。本项目将在此基础上开展Cr基和Mn基化合物的量子临界性和非常规超导电性研究和新超导体探索。在Cr基和Mn基化合物中，通过调控多个自由度（温度，磁场，电场，压力，元素置换等），对其热力学性质、输运性质、电子结构、自旋和电荷激发进行多方面的深入研究，理解这些材料中量子相变和非费米液体行为的起源，揭示量子临界行为和非常规超导电性的关系。在Cr基和Mn基材料中探索新的超导体、乃至高温超导体。

Recently，the applicant of this project and his collaborators discovered superconductivity near a quantum critical point in CrAs and MnP under pressure. These are the first superconductors among the Cr- and Mn-based compounds. The discovery made that the superconductivity could be observed in all the 3d element-based compounds. In this project, we will carry out a systematically study on the unconvebtional superconductivity and the quantum criticality and in Cr- and Mn- based compounds. By control the different parameters including temperature, .magnetic field, electric field, pressure, as well as elements substitutions, we will study the thermodynamic properties, transport properties, electronic structure, and low-lying spin and charge excitations in the systems. Our aim is to understand the physical origin of quantum phase transition and non-Fermi liquid behaviors, to uncover the relationship between quantum criticality and unconventional superconductivity, and to search for novel unconventional superconductors in the Cr- and Mn- based materials.