NMR study on AmO2: Comparison with UO2 and NpO 2

Yo Tokunaga, Tsuyoshi Nishi, Shinsaku Kambe, Masami Nakada, Yoshiya Homma, Hironori Sakai, Hiroyuki Chudo

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4 Citations (Scopus)


Recently, 17O NMR has been performed for the first time on AmO2. We have observed a drastic broadening of the NMR spectrum, along with a sudden drop of NMR signal intensity, below T0 = 8.5 K. These data provide the first microscopic evidence for a phase transition at this temperature as a bulk property of this system. In this paper, we compare NMR results for AmO2 with those from UO2 and NpO2. In the ordered state we have recorded an 17O NMR spectrum with a triangular line shape, which resembles neither that of UO2 nor NpO2. This spectrum indicates that the internal local field H int is distributed very nearly randomly from zero to a maximum value, that is, Hintmax ∼ 7kOe. The temperature dependences of the Knight shift and the nuclear relaxation rate are also compared.

Original languageEnglish
Article numberSA110
JournalJournal of the Physical Society of Japan
Issue numberSUPPL. A
Publication statusPublished - 2011 Jul


  • Actinide dioxide
  • NMR
  • Phase transition
  • Self-radiation effect


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