Multipolar phase transition in NpO2: Comparison with UO 2 From17O-NMR

Yo Tokunaga; Yoshiya Homma; Shinsaku Kambe; Dai Aoki; Kenji Ikushima; Hironori Sakai; Shyugo Ikeda; Etsuji Yamamoto; Akio Nakamura; Yoshinobu Shiokawa; Tatsuya Fujimoto; Russell E. Walstedt; Hiroshi Yasuoka

doi:10.1143/jpsjs.75s.33

Multipolar phase transition in NpO₂: Comparison with UO ₂ From¹⁷O-NMR

Yo Tokunaga, Yoshiya Homma, Shinsaku Kambe, Dai Aoki, Kenji Ikushima, Hironori Sakai, Shyugo Ikeda, Etsuji Yamamoto, Akio Nakamura, Yoshinobu Shiokawa, Tatsuya Fujimoto, Russell E. Walstedt, Hiroshi Yasuoka

Materials Processing and Characterization Division

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

3 Citations (Scopus)

Abstract

We review our recent¹⁷O NMR results on NpO₂. The compound is suggested to exhibit a magnetic octupolar phase transition at T ₀=26 K. From the temperature dependence of¹⁷O- NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T₀. Furthermore, a dramatic dependence of nuclear spin-lattice relaxation rates on applied field has been observed above and below T ₀. These NMR results contrast sharply with those for the antiferromagnet UO₂ and thus highlight the exotic nature of the phase transition in NpO₂.

Original language	English
Pages (from-to)	33-35
Number of pages	3
Journal	journal of the physical society of japan
Volume	75
Issue number	SUPPL.
DOIs	https://doi.org/10.1143/jpsjs.75s.33
Publication status	Published - 2006

Keywords

Multipolar ordering
NMR
Nuclear spin-lattice relaxation rate

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/jpsjs.75s.33

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Multipolar phase transition in NpO₂ : Comparison with UO ₂ From¹⁷O-NMR. / Tokunaga, Yo; Homma, Yoshiya; Kambe, Shinsaku; Aoki, Dai; Ikushima, Kenji; Sakai, Hironori; Ikeda, Shyugo; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu; Fujimoto, Tatsuya; Walstedt, Russell E.; Yasuoka, Hiroshi.

In: journal of the physical society of japan, Vol. 75, No. SUPPL., 2006, p. 33-35.

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

Tokunaga, Yo ; Homma, Yoshiya ; Kambe, Shinsaku ; Aoki, Dai ; Ikushima, Kenji ; Sakai, Hironori ; Ikeda, Shyugo ; Yamamoto, Etsuji ; Nakamura, Akio ; Shiokawa, Yoshinobu ; Fujimoto, Tatsuya ; Walstedt, Russell E. ; Yasuoka, Hiroshi. / Multipolar phase transition in NpO₂ : Comparison with UO ₂ From¹⁷O-NMR. In: journal of the physical society of japan. 2006 ; Vol. 75, No. SUPPL. pp. 33-35.

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title = "Multipolar phase transition in NpO2: Comparison with UO 2 From17O-NMR",

abstract = "We review our recent17O NMR results on NpO2. The compound is suggested to exhibit a magnetic octupolar phase transition at T 0=26 K. From the temperature dependence of17O- NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T0. Furthermore, a dramatic dependence of nuclear spin-lattice relaxation rates on applied field has been observed above and below T 0. These NMR results contrast sharply with those for the antiferromagnet UO2 and thus highlight the exotic nature of the phase transition in NpO2.",

keywords = "Multipolar ordering, NMR, Nuclear spin-lattice relaxation rate",

author = "Yo Tokunaga and Yoshiya Homma and Shinsaku Kambe and Dai Aoki and Kenji Ikushima and Hironori Sakai and Shyugo Ikeda and Etsuji Yamamoto and Akio Nakamura and Yoshinobu Shiokawa and Tatsuya Fujimoto and Walstedt, {Russell E.} and Hiroshi Yasuoka",

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T2 - Comparison with UO 2 From17O-NMR

AU - Tokunaga, Yo

AU - Homma, Yoshiya

AU - Kambe, Shinsaku

AU - Aoki, Dai

AU - Ikushima, Kenji

AU - Sakai, Hironori

AU - Ikeda, Shyugo

AU - Yamamoto, Etsuji

AU - Nakamura, Akio

AU - Shiokawa, Yoshinobu

AU - Fujimoto, Tatsuya

AU - Walstedt, Russell E.

AU - Yasuoka, Hiroshi

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N2 - We review our recent17O NMR results on NpO2. The compound is suggested to exhibit a magnetic octupolar phase transition at T 0=26 K. From the temperature dependence of17O- NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T0. Furthermore, a dramatic dependence of nuclear spin-lattice relaxation rates on applied field has been observed above and below T 0. These NMR results contrast sharply with those for the antiferromagnet UO2 and thus highlight the exotic nature of the phase transition in NpO2.

AB - We review our recent17O NMR results on NpO2. The compound is suggested to exhibit a magnetic octupolar phase transition at T 0=26 K. From the temperature dependence of17O- NMR spectrum, the occurrence of two inequivalent oxygen sites has been confirmed below T0. Furthermore, a dramatic dependence of nuclear spin-lattice relaxation rates on applied field has been observed above and below T 0. These NMR results contrast sharply with those for the antiferromagnet UO2 and thus highlight the exotic nature of the phase transition in NpO2.

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KW - NMR

KW - Nuclear spin-lattice relaxation rate

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