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NMR observation of quadrupolar order parameter in NpO$$_2$$

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

In this paper, we present recent and detailed $$^{17}$$O-NMR results obtained in a single crystal. From the analysis of the field-angle dependence of the NMR spectrum,the appearance of a hyperfine interaction with field-induced antiferro-octupole (AFO) moment has been confirmed. This field-induced AFO moment appears as a result of the longitudinal triple-$$vec{q}$$ antiferro-quadrupole (AFQ) structure in the ordered state. We have also observed spin echo modulations caused by quadrupole interactions between the $$^{17}$$O nuclei and the Np-5f quadrupole moments. This reveals that the AFQ structure is directly observable by NMR. Our NMR results provide further insight into the microscopic nature of multipole phase transitions in f-electron systems.

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