Crystal structure and physical properties of trigonal NpGa3 and Np3Ga11

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

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1 Citation (Scopus)


We have investigated Np-Ga binary phase diagram by the Ga-flux method. We found a new structure type of NpGa3 with the trigonal R3̄m, instead of the previously reported cubic AuCu3-type NpGa3. This compound orders ferromagnetically at 71 K with a saturation moment 1.55 μB/Np with a strong uniaxial anisotropy along the [001] direction. From the structural point of view, the AuCu3-type atomic arrangements are well maintained in the R3̄m structure where the trigonal [001] corresponds to the cubic [111] direction. The uniaxial magnetic anisotropy in trigonal-NpGa3 is consistent with that of cubic NpGa3 along [111], suggesting that the magnetic anisotropy is governed by the local crystal field effects. We also found a new compound Np3Ga 11 and its crystal structure is reported.

Original languageEnglish
Article numberSA109
Journaljournal of the physical society of japan
Issue numberSUPPL. A
Publication statusPublished - 2011 Jul


  • Ferromagnet
  • NpGa
  • NpGa

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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