Crystal structure and magnetic properties of the new ternary actinide compounds AnPdAl (An = U, Np)

新しいアクチノイド化合物AnPdAl(An=U, Np)の結晶構造と磁性

芳賀 芳範   ; 青木 大*; 本間 佳哉*; 池田 修悟; 松田 達磨; 山本 悦嗣  ; 酒井 宏典   ; 立岩 尚之   ; Dung, N. D.*; 中村 彰夫; 塩川 佳伸*; 大貫 惇睦

Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Ikeda, Shugo; Matsuda, Tatsuma; Yamamoto, Etsuji; Sakai, Hironori; Tateiwa, Naoyuki; Dung, N. D.*; Nakamura, Akio; Shiokawa, Yoshinobu*; Onuki, Yoshichika

We report the crystal structure and magnetic properties of new ternary actinide compounds UPdAl and NpPdAl. Both compounds crystallize in the body-center tetragonal ZrAlNi -type tetragonal structure (I 4/mmm). Although the magnetic susceptibility of both compounds follows the Curie-Weiss behavior at high temperature, no magnetic phase transition was observed. UPdAl has a nonmagnetic ground state where the magnetic susceptibility saturates at low temperature, while NpPdAl superconducts below 4.9 K as reported recently.