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Metoki, Naoto; Yamauchi, Hiroki; Matsuda, Masaaki*; Fernandez-Baca, J. A.*; Watanuki, Ryuta*; Hagihara, Masato*
Physical Review B, 97(17), p.174416_1 - 174416_10, 2018/05
Times Cited Count：7 Percentile：30.02(Materials Science, Multidisciplinary)Neutron polarization analysis has been carried out in order to clarify the magnetic structure of multiple order parameter 
-electron system NdB. We confirmed the non-collinear "all-in all-out" structure (
) of the in-plane moment. We found that the magnetic moment along the 
-axis 
showed diagonally antiferromagnetic structure (
). The unusual magnetic ordering is phenomenologically understood via Landau theory. We also found that a long-period incommensurate modulation of the (
) antiferromagnetic structure of with the propagation 
= (0.14, 0.14, 0.1) and 
= (0.2, 0, 0.1) in phase III and IV, respectively. It is clear that the multipole degree-of-freedom based on pseudo-quartet -electron state play important role.
; Comparison with UO
from 
O-NMRTokunaga, Yo; Homma, Yoshiya*; Kambe, Shinsaku; Aoki, Dai*; Ikushima, Kenji; Sakai, Hironori; Ikeda, Shugo; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu; et al.
Journal of the Physical Society of Japan, 75(Suppl.), p.33 - 35, 2006/08
The low-temperature phase transition in NpO has attracted much attention as a promising candidate for a new class of phase transitions associated with octupolar degrees of freedom. In order to elucidate the nature of this exotic phase transition in NpO, we have initiated the first O-NMR measurements on this system using a powder sample. From the O-NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below 
= 26 K. It has also been shown that the temperature and field dependence of the O NMR spectrum can be understood by considering an unconventional hyperfine interaction between the O nuclear spins and field-induced antiferromagnetic moments arising from the longitudinal triple-
antiferro-quadrupolar order. These NMR results give strong evidence for the occurrence of the longitudinal triple- multipole structure in NpO. We will also discuss our recent O-NMR results in a single crystal.
probed by NMRTokunaga, Yo; Homma, Yoshiya*; Kambe, Shinsaku; Aoki, Dai*; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu; Walstedt, R. E.; Yasuoka, Hiroshi
Physica B; Condensed Matter, 378-380, p.929 - 930, 2006/05
Times Cited Count：3 Percentile：17.95(Physics, Condensed Matter)We have initiated the first O-NMR measurements in the ordered state of NpO. From the O-NMR spectrum, we have confirmed the occurrence of two inequivalent oxygen sites below = 26 K. It has also been shown that the O-NMR spectrum in the ordered state can be understood by considering an unconventional hyperfine interaction between the O nuclear spins and field-induced antiferromagnetic moments arising from the longitudinal triple-
antiferro-quadrupolar order. These NMR results give strong evidence for the occurrence of the longitudinal triple- multipole structure in NpO.
multipole structure in NpOTokunaga, Yo; Homma, Yoshiya*; Kambe, Shinsaku; Aoki, Dai*; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu; Walstedt, R. E.; Yasuoka, Hiroshi
Physical Review Letters, 94(13), p.137209_1 - 137209_4, 2005/04
Times Cited Count：78 Percentile：90.06(Physics, Multidisciplinary)In order to elucidate the nature of the exotic ordered phase of NpO below = 26 K, we have initiated the first O-NMR measurements on this system. From the O-NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below . It has also been shown that the characteristic features of the hyperfine interaction at the oxygen sites are well explained by invoking a hyperfine interaction with field-induced antiferromagnetic moments which appear as a result of the triple- antiferro-quadrupolar order. The NMR findings strongly support the occurrence of the longitudinal triple- multipole structure in NpO.
Metoki, Naoto; Yamauchi, Hiroki; Matsuda, Masaaki*; Fernandez Baca, J.*; Yoshida, Masahiro*; Yoshizawa, Hideki*; Hagihara, Masato*; Watanuki, Ryuta*
no journal, ,
We report the magnetic structures and propose the mechanism of the successive transition based on the -electron state revealed by CEF excitation. We confirmed the non-collinear `all-in all-out' structure (
) of the in-plane moment. We found that the magnetic moment along the -axis showed diagonally antiferromagnetic structure (). The unusual magnetic ordering is phenomenologically understood via Landau theory. We also found that a long-period incommensurate modulation of the () antiferromagnetic structure of with the propagation = (0.14, 0.14, 0.1) and = (0.2, 0, 0.1) in phase III and IV, respectively. We found pseudo-quartet -electron state based on 
and 
. We can propose the intermediated phase as the magnetically ordered phase of 
while 
and 
coupling phase tabilized in low temperatures.
