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Crystal structure and magnetic properties of the new ternary actinide compounds AnPd$$_5$$Al$$_2$$ (An = U, Np)

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 UPd$$_5$$Al$$_2$$ and NpPd$$_5$$Al$$_2$$. Both compounds crystallize in the body-center tetragonal ZrAl$$_5$$Ni$$_2$$ -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. UPd$$_5$$Al$$_2$$ has a nonmagnetic ground state where the magnetic susceptibility saturates at low temperature, while NpPd$$_5$$Al$$_2$$ superconducts below 4.9 K as reported recently.

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Category:Chemistry, Physical

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