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

针对层状氮化物超导体单晶的详细研究，发现制备足够尺寸的晶体是非常困难的。然后我们改变了计划，并开发了一种热容电池，用于空气敏感材料，使系统的热容测量成为可能，甚至使用多晶样品。利用这种方法，我们发现了磁波动对实现超导性的贡献，类似于高转变温度铜超导体。该方法可用于其它具有空气敏感性的材料体系。此外，我们还成功地开发了一种寻找电场诱导超导性的新方法。

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.