NMR evidence for higher-order multipole order parameters in NpO2

Y. Tokunaga; D. Aoki; Y. Homma; S. Kambe; H. Sakai; S. Ikeda; T. Fujimoto; R. E. Walstedt; H. Yasuoka; E. Yamamoto; A. Nakamura; Y. Shiokawa

doi:10.1103/PhysRevLett.97.257601

NMR evidence for higher-order multipole order parameters in NpO2

Y. Tokunaga, D. Aoki, Y. Homma, S. Kambe, H. Sakai, S. Ikeda, T. Fujimoto, R. E. Walstedt, H. Yasuoka, E. Yamamoto, A. Nakamura, Y. Shiokawa

IMR - Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

We report a microscopic investigation of multipolar order parameters in the ordered state of NpO2 conducted via O17 NMR on a single crystal. From the angular dependence of hyperfine fields at O17 nuclei, we have obtained clear evidence for the appearance of field-induced antiferro-octupolar as well as field-induced antiferro-dipolar moments below T0=26K. We have also observed oscillatory spin-echo decay, which is well understood in terms of small electric field gradients created by antiferro-quadrupolar ordering. This reveals that the quadrupolar order parameter is directly observable by means of NMR. The present NMR studies provide definitive support for a proposed longitudinal triple-q type octupolar-quadrupolar ordering model for NpO2.

Original language	English
Article number	257601
Journal	Physical Review Letters
Volume	97
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.97.257601
Publication status	Published - 2006

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10.1103/PhysRevLett.97.257601

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title = "NMR evidence for higher-order multipole order parameters in NpO2",

abstract = "We report a microscopic investigation of multipolar order parameters in the ordered state of NpO2 conducted via O17 NMR on a single crystal. From the angular dependence of hyperfine fields at O17 nuclei, we have obtained clear evidence for the appearance of field-induced antiferro-octupolar as well as field-induced antiferro-dipolar moments below T0=26K. We have also observed oscillatory spin-echo decay, which is well understood in terms of small electric field gradients created by antiferro-quadrupolar ordering. This reveals that the quadrupolar order parameter is directly observable by means of NMR. The present NMR studies provide definitive support for a proposed longitudinal triple-q type octupolar-quadrupolar ordering model for NpO2.",

author = "Y. Tokunaga and D. Aoki and Y. Homma and S. Kambe and H. Sakai and S. Ikeda and T. Fujimoto and Walstedt, {R. E.} and H. Yasuoka and E. Yamamoto and A. Nakamura and Y. Shiokawa",

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T1 - NMR evidence for higher-order multipole order parameters in NpO2

AU - Tokunaga, Y.

AU - Aoki, D.

AU - Homma, Y.

AU - Kambe, S.

AU - Sakai, H.

AU - Ikeda, S.

AU - Fujimoto, T.

AU - Walstedt, R. E.

AU - Yasuoka, H.

AU - Yamamoto, E.

AU - Nakamura, A.

AU - Shiokawa, Y.

PY - 2006

Y1 - 2006

N2 - We report a microscopic investigation of multipolar order parameters in the ordered state of NpO2 conducted via O17 NMR on a single crystal. From the angular dependence of hyperfine fields at O17 nuclei, we have obtained clear evidence for the appearance of field-induced antiferro-octupolar as well as field-induced antiferro-dipolar moments below T0=26K. We have also observed oscillatory spin-echo decay, which is well understood in terms of small electric field gradients created by antiferro-quadrupolar ordering. This reveals that the quadrupolar order parameter is directly observable by means of NMR. The present NMR studies provide definitive support for a proposed longitudinal triple-q type octupolar-quadrupolar ordering model for NpO2.

AB - We report a microscopic investigation of multipolar order parameters in the ordered state of NpO2 conducted via O17 NMR on a single crystal. From the angular dependence of hyperfine fields at O17 nuclei, we have obtained clear evidence for the appearance of field-induced antiferro-octupolar as well as field-induced antiferro-dipolar moments below T0=26K. We have also observed oscillatory spin-echo decay, which is well understood in terms of small electric field gradients created by antiferro-quadrupolar ordering. This reveals that the quadrupolar order parameter is directly observable by means of NMR. The present NMR studies provide definitive support for a proposed longitudinal triple-q type octupolar-quadrupolar ordering model for NpO2.

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JF - Physical Review Letters

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NMR evidence for higher-order multipole order parameters in NpO2

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