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Report No.
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NMR investigation of quadrupole order parameter in actinide dioxides

Tokunaga, Yo  ; Homma, Yoshiya*; Kambe, Shinsaku  ; Aoki, Dai*; Sakai, Hironori   ; Chudo, Hiroyuki ; Ikushima, Kenji*; Yamamoto, Etsuji  ; Nakamura, Akio; Shiokawa, Yoshinobu*; Walstedt, R. E.*; Yasuoka, Hiroshi

Multipolar degrees of freedom characteristic of $$f$$-electrons bring rich and complex physics to rare-earth and actinide compounds. In the present work, we demonstrate that microscopic investigation of multipole order parameters is also possible by means of NMR through the hyperfine interactions. Our $$^{17}$$O NMR study performed on a single crystal of NpO$$_2$$ provide definitive support for the proposed longitudinal triple-$$q$$ type antiferro-octupolar ordering below $$T_0=$$26 K. We shall also provide our $$^{17}$$O NMR results on UO$$_2$$ and PuO$$_2$$. The microscopic NMR clearly indicates the different nature of the magnetic ground states among three actinide dioxides.

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