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

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

We have initiated the first $$^{17}$$O-NMR measurements in the ordered state of NpO$$_2$$. From the $$^{17}$$O-NMR spectrum, we have confirmed the occurrence of two inequivalent oxygen sites below $$T_0$$= 26 K. It has also been shown that the $$^{17}$$O-NMR spectrum in the ordered state can be understood by considering an unconventional hyperfine interaction between the $$^{17}$$O nuclear spins and field-induced antiferromagnetic moments arising from the longitudinal triple-$$bf{q}$$ antiferro-quadrupolar order. These NMR results give strong evidence for the occurrence of the longitudinal triple-$$bf{q}$$ multipole structure in NpO$$_2$$.

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Category:Physics, Condensed Matter

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