Multipolar phase transition in NpO 2: Comparison with UO 2 From 17O-NMR

Yo Tokunaga, Yoshiya Homma, Shinsaku Kambe, Dai Aoki, Kenji Ikushima, Hironori Sakai, Shyugo Ikeda, Etsuji Yamamoto, Akio Nakamura, Yoshinobu Shiokawa, Tatsuya Fujimoto, Russell E. Walstedt, Hiroshi Yasuoka

Research output: Contribution to journalArticle

3 Citations (Scopus)


We review our recent 17O NMR results on NpO 2. The compound is suggested to exhibit a magnetic octupolar phase transition at T 0=26 K. From the temperature dependence of 17O- NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T 0. Furthermore, a dramatic dependence of nuclear spin-lattice relaxation rates on applied field has been observed above and below T 0. These NMR results contrast sharply with those for the antiferromagnet UO 2 and thus highlight the exotic nature of the phase transition in NpO 2.

Original languageEnglish
Pages (from-to)33-35
Number of pages3
Journaljournal of the physical society of japan
Issue numberSUPPL.
Publication statusPublished - 2006 Dec 1


  • Multipolar ordering
  • NMR
  • NpO
  • Nuclear spin-lattice relaxation rate
  • UO

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Tokunaga, Y., Homma, Y., Kambe, S., Aoki, D., Ikushima, K., Sakai, H., Ikeda, S., Yamamoto, E., Nakamura, A., Shiokawa, Y., Fujimoto, T., Walstedt, R. E., & Yasuoka, H. (2006). Multipolar phase transition in NpO 2: Comparison with UO 2 From 17O-NMR. journal of the physical society of japan, 75(SUPPL.), 33-35.