NMR studies of actinide dioxides

Tokunaga, Y.; Sakai, Hironori; Fujimoto, Tatsuya; Kambe, S.; Walstedt, R. E.; Ikushima, Kenji; Yaśuoka, Hiroshi; Aoki, Dai; Homma, Yoshiya; Haga, Yoshinori; Matsuda, Tatsuma D.; Ikeda, S.; Yamamoto, Etsuji; Shiokawa, Y.; Nakajima, Kunihisa; Arai, Y.; Ōnuki, Yoshichika

doi:10.1016/j.jallcom.2007.03.082

Cited by 24 publications

(16 citation statements)

References 30 publications

(46 reference statements)

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“…The advantage of NMR experiments is that the static and dynamical electronic properties can be selectively probed for each site in a given compound. In the ordered state of UO 2 , for example, the 17 O NMR has revealed the existence of a large internal field with a tiny electronic field gradient at oxygen sites [1,6,7]. These results have confirmed the transverse triple-q type ordering of magnetic dipoles in UO 2 .…”

Section: Introductionmentioning

confidence: 62%

“…In order to investigate the electronic state of AnO 2 from a microscopic viewpoint, we have performed a series of nuclear magnetic resonance (NMR) studies using 17 O nuclei [1][2][3][4][5][6][7][8]. The advantage of NMR experiments is that the static and dynamical electronic properties can be selectively probed for each site in a given compound.…”

Section: Introductionmentioning

confidence: 99%

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17O NMR study in (Pu0.91Am0.09)O2

Tokunaga

Osaka

Kambe

et al. 2010

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

17O NMR study in (Pu0.91Am0.09)O2

Tokunaga

Osaka

Kambe

et al. 2010

Journal of Nuclear Materials

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“…Figures 14(e) and 14(f) show the 17 O NMR spectrum at T ¼ 8 and 6.2 K. 109) We have obtained a narrow spectrum with half-width of $8 kHz. The narrow spectrum is very similar to those in the paramagnetic state of NpO 2 and UO 2 , suggesting that there is no quadrupole splitting and no appreciable anisotropic NMR shift at the O sites.…”

Section: Multipolar Ordering In Npomentioning

confidence: 87%

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

et al. 2007

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In this paper we present highlights from a 6-year program of NMR/NQR/AFNMR studies carried out on both actinide and ligand nuclear spins in oxides and intermetallic compounds of the actinide elements U, Np, and Pu. We begin with the large family of actinide 115 compounds, consisting of metallic antiferromagnets, metamagnets, Pauli paramagnets, and the superconducting Pu-based systems. Short summaries are presented of 69;71 Ga NMR studies of the exotic metamagnet NpCoGa 5 , the surprisingly inhomogeneous UCoGa 5 , and the heavy-fermion ''high-T c '' superconductors PuTGa 5 , T ¼ Rh and Co. The case of microdomains in the metallic antiferromagnet UGa 3 is briefly reviewed. Next, we summarize the direct and indirect 235 U NMR studies on USb 2 and URh 3 . These are the first studies of their kind and the only studies of 235 U NMR in a metallic environment. Under the heading of actinide oxides we recap our original studies of 235 U and 17 O NMR in UO 2 , followed by a summary of our investigation of multipolar ordering in NpO 2 via 17 O NMR, in which the 237 Np NMR parameters were determined via cross-relaxation effects. And finally, we summarize our 31 P study of the ferromagnetic transition in the filled Skutterudite UFe 4 P 12 .

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“…[2][3][4] Experimental measurements of the AnO2 are therefore complicated not only by their radiogenic nature, [2][3][4] but also due to the inhomogeneity of samples. [5][6][7][8][9][10] Computational techniques, however, offer a complementary method to circumvent many of these problems and obtain detailed insight into AnO2 structures and properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Structure of UO2 and NpO2 by First-Principle Methods

Pegg¹,

Shields²,

Storr³

et al. 2018

Preprint

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The magnetic structure of the actinide dioxides (AnO2) remains a subject of intense research and is key to the development of high-accuracy computational models. A low-temperature experimental investigation of the magnetic ground-state is complicated by thermal energy released from the radioactive decay of the actinide nuclei. To establish the magnetic groundstate, we have employed high-accuracy computational methods to systematically probe different magnetic structures. A transverse 1k antiferromagnetic ground-state with Fmmm (No. 69) crystal symmetry has been established for UO2, whereas a ferromagnetic (111) ground-state with R3 ̅ m (No. 166) has been established for NpO2. This has a profound impact on future computational investigations. Band structure calculations have been performed to analyse these results.

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NMR studies of actinide dioxides

Cited by 24 publications

References 30 publications

17O NMR study in (Pu0.91Am0.09)O2

17O NMR study in (Pu0.91Am0.09)O2

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Magnetic Structure of UO2 and NpO2 by First-Principle Methods

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