NMR evidence for triple-q multipole structure in NpO2.
NMR evidence for triple-q multipole structure in NpO2.
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NpO2 中三 q 多极结构的 NMR 证据。
DOI：
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发表时间：
2005
影响因子：
8.6
通讯作者：
H. Yasuoka
中科院分区：
文献类型：
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作者：
Y. Tokunaga;Y. Homma;S. Kambe;D. Aoki;H. Sakai;E. Yamamoto;A. Nakamura;Y. Shiokawa;Y. Shiokawa;R. Walstedt;H. Yasuoka
为了阐明NPO2在T(0)=26K以下的奇异有序相的性质，我们首次对该体系进行了17O-核磁共振测量。从~(17)O-核磁共振谱中，证实在T_0以下存在两个不同的氧位。结果还表明，氧位的超精细相互作用的特征可以通过引用由三q反铁四极有序引起的场诱导反铁磁矩的超精细相互作用来很好地解释。核磁共振结果有力地支持了NPO2中存在纵向三Q多极结构。
In order to elucidate the nature of the exotic ordered phase of NpO2 below T(0)=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.