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Thermodynamics Investigation on pressure-induced superconductor CeNiGe$$_3$$ by ac calorimetry

圧力誘起超伝導物質CeNiGe$$_3$$の高圧下交流比熱測定による研究

立岩 尚之   ; 芳賀 芳範   ; 松田 達磨; 池田 修悟; 中島 美帆*; Thamizhavel, A.*; 摂待 力生*; 大貫 惇睦

Tateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Nakashima, Miho*; Thamizhavel, A.*; Settai, Rikio*; Onuki, Yoshichika

われわれは重い電子系圧力誘起超伝導物質の研究を熱電対を用いた高圧下交流比熱測定を通して行ってきた。この手法では高精度の測定が可能であり、超伝導転移温度などが精密に決定することができる。本会議では、CePt$$_3$$Si, CeNiGe$$_3$$, UIrなどの圧力誘起超伝導物質についてわれわれの最近の研究結果を報告する。研究の結果得られた圧力相図を示し、これらの物質の磁性と超伝導の関係について議論する。

We have investigated the physical properties of Heavy Fermion superconductors by the ac calorimetry under high pressure using a thermocouple. The method is powerful tool since the high sensitive measurement of the heat capacity is possible and the precise pressure dependence of transition temperatures such as the superconducting transition can be determined. In this conference, I would like to report our investigations on the heavy fermion superconductors CePt$$_3$$Si, CeNiGe$$_3$$ and UIr. We have made pressure phase diagram of these compounds and discuss the relation between the magnetism and superconductivity.

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