Abstract
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- q antiferro-quadrupolar order. These NMR results give strong evidence for the occurrence of the longitudinal triple- q multipole structure in NpO 2 .
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