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Multipolar ordering in NpO$$_2$$ probed by NMR

Tokunaga, Yo  ; Kambe, Shinsaku  ; Sakai, Hironori   ; Fujimoto, Tatsuya*; Ikeda, Shugo; Yamamoto, Etsuji  ; Nakamura, Akio; Walstedt, R. E.*; Yasuoka, Hiroshi; Homma, Yoshiya*; Aoki, Dai*; Shiokawa, Yoshinobu*

We have initiated the first NMR measurements in the ordered state of NpO$$_2$$. From the angular dependence of hyperfine fields at $$^{17}$$O nuclei, we have obtained clear evidence for the appearance of field-induced antiferro-octupolar as well as field-induced antiferro-dipolar moments below T$$_0$$=26 K. The NMR studies provide definitive support for the proposed longitudinal triple-q antiferro-octupolar ordering model for NpO$$_2$$.



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