5<i>f</i>-electron states in uranium dioxide investigated using high-resolution neutron spectroscopy

Amoretti, G.; Blaise, A.; Caciuffo, R.; Fournier, J.M.; Hutchings, M. T.; Osborn, R.; Taylor, A.D.

doi:10.1103/physrevb.40.1856

Cited by 142 publications

(106 citation statements)

References 37 publications

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“…As µ k can assume two mutually orthogonal directions for each k value (for instance, µ k parallel to [010] Experiments on powder samples with chopper spectrometers at spallation neutron sources allowed a precise and reliable determination of the CF Hamiltonian acting on the U ions 9 , and experiments with triple-axis spectrometers and axial polarization analysis have been performed to study collective excitations in the ordered phase, and dispersive magnetic excitons in the paramagnetic phase 10 . The experimental picture is therefore exhaustive, but a satisfying theoretical description of low-temperature collective excitations is still missing.…”

Section: Introductionmentioning

confidence: 99%

Resonant x-ray scattering study of magnetic-dipole and electric-quadrupole order inU0.75Np0.25O2

et al. 2004

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Section: Introductionmentioning

confidence: 99%

Resonant x-ray scattering study of magnetic-dipole and electric-quadrupole order inU0.75Np0.25O2

et al. 2004

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“…72,[81][82][83][84] This phase transition also causes an internal distortion of the oxygen cubes that surround the U cations. 85,86) Furthermore, recent resonant x-ray scattering (RXS) measurements have reported that long-range antiferro-quadrupolar (AFQ) ordering coexists with the ''primary'' AFM ordering below T N .…”

Section: 1mentioning

confidence: 99%

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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“…Crystalfield calculations were first performed in the 1960s 13 but a direct observation was not obtained until the first spallation neutron sources became available 14,15 in the 1980s. The crystal-field potential was then found to be a factor of 3 smaller than proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Resonant x-ray spectroscopy of uranium intermetallics at the M4,5 edges of uranium

et al. 2017

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We present resonant x-ray emission spectroscopic (RXES) data from the uranium intermetallics UPd3, USb, USn3 and URu2Si2 at the U M4,5 edges and compare the data to those from the well-localized 5f 2 semiconductor UO2. The technique is especially sensitive to any oxidation of the surface, and this was found on the USb sample, thus preventing a good comparison with a material known to be 5f 3 . We have found a small energy shift between UO2 and UPd3, both known to have localized 5f 2 configurations, which we ascribe to the effect of conduction electrons in UPd3. The spectra from UPd3 and URu2Si2 are similar, strongly suggesting a predominant 5f 2 configuration for URu2Si2. The valence-band resonant inelastic x-ray scattering (RIXS) provides information on the U P3 transitions (at about 18 eV) between the U 5f and U 6p states, as well as transitions of between 3 and 7 eV from the valence band into the unoccupied 5f states. These transitions are primarily involving mixed ligand states (O 2p or Pd, Ru 4d) and U 5f states. Calculations are able to reproduce both these low-energy transitions reasonably well.

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5f-electron states in uranium dioxide investigated using high-resolution neutron spectroscopy

Cited by 142 publications

References 37 publications

Resonant x-ray scattering study of magnetic-dipole and electric-quadrupole order inU0.75Np0.25O2

Resonant x-ray scattering study of magnetic-dipole and electric-quadrupole order inU0.75Np0.25O2

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Resonant x-ray spectroscopy of uranium intermetallics at the M4,5 edges of uranium

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