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Crystal structure and physical properties of trigonal NpGa$$_3$$ and Np$$_{3}$$Ga$$_{11}$$

Haga, Yoshinori   ; Aoki, Dai*; Homma, Yoshiya*; Matsuda, Tatsuma; Ikeda, Shugo*; Sakai, Hironori   ; Yamamoto, Etsuji  ; Nakamura, Akio; Shiokawa, Yoshinobu*; Onuki, Yoshichika

We report reinvestigation the Np-Ga binary system. We successfully obtained NpGa$$_3$$ single crystals. Detailed investigation of the crystal structure using the single-crystal X-ray diffraction has shown that the flux-grown NpGa$$_3$$ crystallizes not in cubic but in the trigonal R$$overline{3}$$m structure. It orders ferromagnetically at 70 K with the saturation moment of 1.5 $$mu_{rm B}$$/Np. It is interesting to note that the cubic NpGa$$_3$$ orders antimagnetically at similar temperature 62 and become ferromagnetic under magnetic field with the similar saturation moment 1.6 $$mu_{rm B}$$/Np. These characteristics are understood from the structural point of view.



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Category:Physics, Multidisciplinary



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