Clarifying superconducting gap symmetry and ordered states in the layered nitride superconductors

为了对层状氮化物超导体进行详细的单晶研究，要合成出能够满足实验需要的尺寸的单晶是非常困难的。然后我们改变了计划，开发了一种用于空气敏感材料的热容电池，即使使用多晶样品也可以进行系统的热容测量。利用这种方法，我们发现了类似于高温铜酸盐超导体的磁涨落对实现超导电性的贡献。该方法可推广应用于其他气敏材料体系。此外，我们还成功地发展了一种寻找电场诱导超导电性的新方法。

Aiming at detailed studies of layered nitride superconductors using the single crystals, the synthesis of the crystals that have enough size for the experiments was found to be very difficult. Then we changed the plan, and developed a heat capacity cell for air-sensitive materials that makes systematic heat capacity measurements available, even using polycrystalline specimens. Using this method, we found a contribution of magnetic fluctuations to realize superconductivity, similar to high-transition temperature cuprate superconductors. The developed method can be useful in other material systems with air-sensitivity. Furthermore, we succeeded in developing a new method for searching electric-field-induced superconductivity.