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Novel pressure phase diagram of heavy fermion superconductor CePt$$_{3}$$Si investigated by ac calorimetry

交流比熱測定による重い電子系超伝導物質CePt$$_{3}$$Siの新奇な圧力相図

立岩 尚之  ; 芳賀 芳範 ; 松田 達磨; 池田 修悟; 安田 敬*; 竹内 徹也*; 摂待 力生*; 大貫 惇睦

Tateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Yasuda, Takashi*; Takeuchi, Tetsuya*; Settai, Rikio*; Onuki, Yoshichika

結晶反転対称性のない重い電子系超伝導物質CePt$$_3$$Siの反強磁性・超伝導転移温度の圧力依存性を交流比熱測定によって調べた。常圧で2.2Kである反強磁性転移温度(ネール温度$$T_{rm N}$$)は加圧とともに減少し消滅する。反強磁性臨界圧力$$P_{rm AF}$$は0.6GPaと決定された。一方、超伝導相は常圧から1.5GPaの幅広い圧力領域で存在する。CePt$$_3$$Siの圧力相図は大変独創的で、これまでの重い電子系超伝導物質の圧力相図と大きな違いがある。

The pressure dependences of the antiferromagnetic and superconducting transition temperatures have been investigated by ac heat capacity measurement under high pressures for the heavy-fermion superconductor CePt$$_3$$Si without inversion symmetry in the tetragonal structure. The N$'e$el temperature $$T_{rm N}$$ = 2.2 K decreases with increasing pressure and becomes zero at the critical pressure $$P_{rm AF}$$ $$simeq$$ 0.6 GPa. On the other hand, the superconducting phase exists in a wider pressure region from ambient pressure to about 1.5 GPa. The pressure phase diagram of CePt$$_3$$Si is thus very unique and has never been reported before for other heavy fermion superconductors.

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パーセンタイル:89.13

分野:Physics, Multidisciplinary

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