NMR evidence for triple-q→ multipole structure in NpO2

Y. Tokunaga, Y. Homma, S. Kambe, D. Aoki, H. Sakai, E. Yamamoto, A. Nakamura, Y. Shiokawa, R. E. Walstedt, H. Yasuoka

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


In order to elucidate the nature of the exotic ordered phase of NpO 2 below T0 = 26 K, we have initiated the first 17O-NMR measurements on this system. From the 17O-NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T0- It has also been shown that the characteristic features of the hyperfine interaction at the oxygen sites are well explained by invoking a hyperfine interaction with field-induced antiferromagnetic moments which appear as a result of the triple-q→ antiferroquadrupolar order. The NMR findings strongly support the occurrence of the longitudinal triple-q→ multipole structure in NpO2.

Original languageEnglish
Article number137209
JournalPhysical review letters
Issue number13
Publication statusPublished - 2005 Apr 8

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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