Crystal-field transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Kern, S.; Robinson, R. A.; Nakotte, H.; Lander, G. H.; Cort, B.; Watson, P. C.; Vigil, Fidel A.

doi:10.1103/physrevb.59.104

Cited by 74 publications

(59 citation statements)

References 17 publications

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“…105. 107) This value is, however, in complete disagreement with that derived from the susceptibility measurements. In a simple model, a separation of 123 meV corresponds to a susceptibility of $10 Â 10 À4 emu/mol, and requires a deviation from T-constant behavior above T $ 400 K. 107,108) In order to investigate the magnetic ground state of PuO 2 , we have performed 17 O NMR measurements on this system for the first time.…”

Section: Multipolar Ordering In Npocontrasting

confidence: 46%

“…These contributions, however, should be more important at high temperatures, since the À 1 to À 4 splitting is suggested to be more than 100 meV in PuO 2 . 106,107) At low temperatures, we can also expect relaxation processes caused by phonons and/or by a small quantity of magnetic impurities, to the extent that they exist. To completely identify the T 1 mechanisms in PuO 2 , further experimental investigation over a wider temperature range will be required.…”

Section: Multipolar Ordering In Npomentioning

confidence: 99%

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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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Section: Multipolar Ordering In Npocontrasting

confidence: 46%

Section: Multipolar Ordering In Npomentioning

confidence: 99%

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

et al. 2007

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“…The crystal field was measured by Kern and co-workers using inelastic neutron scattering (INS) 17 . Our calculated Γ 1 → Γ 4 excitation energy of 97 meV agrees reasonably well with the measured value of 123 meV 17 and a previous calculation of 99 meV by Colarieti-Tosti et al 27 .…”

Section: Puo2mentioning

confidence: 99%

Self-consistent density functional calculations of the crystal field levels in lanthanide and actinide dioxides

Zhou

Ozoliņš

2012

Phys. Rev. B

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Using a recently developed method combining a nonspherical self-interaction corrected LDA+U scheme and an on-site multi-body Hamiltonian [Phys. Rev. B 83, 085106 (2011)], we calculate the crystal field parameters and crystal field (CF) excitation levels of f -element dioxides in the fluorite structure with f n electronic configurations, including n = 1 (PaO2, PrO2), n = 2 (UO2), n = 3 (NpO2), and n = 4 (PuO2). It is shown that good agreement with experimental data (within approximately 10 to 20 meV) can be obtained in all cases. The properties of the multi-electron CF ground states are analyzed.

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“…19,20 Thus, from the viewpoint of magnetism, PuO 2 did not attract much attention. Now let us turn our attention to AmO 2 .…”

Section: 18mentioning

confidence: 99%

Microscopic analysis of multipole susceptibility of actinide dioxides: A scenario of multipole ordering inAmO2

Hotta

2009

Phys. Rev. B

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By evaluating multipole susceptibility of a seven-orbital impurity Anderson model with the use of a numerical renormalization group method, we discuss possible multipole states of actinide dioxides at low temperatures. In particular, here we point out a possible scenario for multipole ordering in americium dioxide. For Am 4+ ion with five 5f electrons, it is considered that the ground state is Γ − 7doublet and the first excited state is Γ − 8 quartet, but we remark that the f 5 ground state is easily converted due to the competition between spin-orbit coupling and Coulomb interactions. Then, we find that the Γ − 8 quartet can be the ground state of AmO2 even for the same crystalline electric field potential. In the case of Γ − 8 quartet ground state, the numerical results suggest that high-order multipoles such as quadrupole and octupole can be relevant to AmO2.

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Crystal-field transition inPuO2

Cited by 74 publications

References 17 publications

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Self-consistent density functional calculations of the crystal field levels in lanthanide and actinide dioxides

Microscopic analysis of multipole susceptibility of actinide dioxides: A scenario of multipole ordering inAmO2

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