NMR Evidence for Triple- q → Multipole Structure in NpO 2
作者： Y. Tokunaga , Y. Homma , S. Kambe , D. Aoki , H. Sakai
DOI: 10.1103/PHYSREVLETT.94.137209
关键词:
摘要: In order to elucidate the nature of exotic ordered phase ${\mathrm{NpO}}_{2}$ below ${T}_{0}=26\text{ }\text{ }\mathrm{K}$, we have initiated first $^{17}\mathrm{O}\mathrm{\text{\ensuremath{-}}}\mathrm{NMR}$ measurements on this system. From spectrum, occurrence two inequivalent oxygen sites has been confirmed ${T}_{0}$. It also shown that characteristic features hyperfine interaction at are well explained by invoking a with field-induced antiferromagnetic moments which appear as result triple-$\stackrel{\ensuremath{\rightarrow}}{q}$ antiferroquadrupolar order. The NMR findings strongly support longitudinal multipole structure in ${\mathrm{NpO}}_{2}$.
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