Heat capacity measurement on the pressure induced Ce superconductors

Tateiwa, Naoyuki   ; Haga, Yoshinori   ; Matsuda, Tatsuma; Shishido, Hiroaki*; Nakashima, Miho*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika*

We have perfomed the ac heat capacity measurement on the Ce-based pressure induced superconductor. In this meeting, We will show our experimental results as well as the experimental apparatuses for the measuremnt. Especially, we will focus on the pressure induced superconductor CeNiGe that orders antiferromagnetically at 5.5K at ambient pressure. The transition temperature increases with increasing pressure, becomes maximum around 3GPa, and then decreases with the higher pressure region. The antiferromagnetic critical pressure is around 7GPa. We performed the ac heat capacity measurement under high pressure. The superconducting anomaly due to the superconducting transition was observed around 0.3K. From this observation, we concluded the bulk nature of the superconductivity.