Multipolar phase transition in NpO2: Comparison with UO 2 From17O-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 journalArticlepeer-review

3 Citations (Scopus)


We review our recent17O NMR results on NpO2. The compound is suggested to exhibit a magnetic octupolar phase transition at T 0=26 K. From the temperature dependence of17O- NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T0. 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 UO2 and thus highlight the exotic nature of the phase transition in NpO2.

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


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

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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