The solid-state properties of uranium A historical perspective and review

Lander, G. H.; Fisher, E.S.; Bader, S. D.

doi:10.1080/00018739400101465

Cited by 170 publications

(127 citation statements)

References 164 publications

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“…For comparison, -U is also superconducting, with a maximum T c of 2.4 K at 1.2 GPa-where its CDW appears to be suppressed-and a somewhat lower T c down to 0.5 K in the modulated phases [15,36]. We have already pointed out how similar the phonon anomalies-and the deviations between computational and experimental results-are for the two elements.…”

Section: Prl 108 045502 (2012) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 67%

“…Further transitions occur at lower temperatures, where the components of the modulation vector successively lock in at commensurate values [13][14][15]. Fast et al [16] identified the Peierls-type opening of partial gaps of electronic bands at the Fermi level as the origin of the CDW and pointed out the strong Fermisurface nesting of narrow bands with predominantly f character.…”

mentioning

confidence: 99%

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Lattice Dynamics and Superconductivity in Cerium at High Pressure

et al. 2012

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We have measured phonon dispersion relations of the high-pressure phase cerium-oC(4) (alpha phase with the alpha-uranium crystal structure) at 6.5 GPa by using inelastic x-ray scattering. Pronounced phonon anomalies are observed, which are remarkably similar to those of alpha-U. First-principles electronic structure calculations reproduce the anomalies and allow us to identify strong electron-phonon coupling as their origin. At the low-pressure end of its stability range, Ce-oC4 is on the verge of a lattice-dynamical instability and possibly a charge density wave. The superconducting transition temperatures of the fcc, oC4, and mC4 phases of Ce have been calculated, and the superconductivity observed experimentally by Wittig and Probst is attributed to the oC4 phase.Funding Agencies|United Kingdom Engineering and Physical Sciences Research Council||Wenner-Gren Foundation, Sweden||Swedish Foundation for Strategic Research||European Research Council||eDIKT initiative|41

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Section: Prl 108 045502 (2012) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 67%

mentioning

confidence: 99%

Lattice Dynamics and Superconductivity in Cerium at High Pressure

et al. 2012

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“…A recent surge of interest in the actinides has occurred, driven by the variety of exotic behaviors exhibited in 5f metals and compounds [1][2][3][4][5][6][7][8][9][10][11], such as the discovery of Pu-based superconductivity [8][9][10], and the unique phonon dispersion observed in -U [6,7] and -Pu [3][4][5]. Along the actinide series a volume anomaly occurs near Pu, due to a change in the bonding behavior of the valence states (see Figure 1 [11]).…”

Section: Introductionmentioning

confidence: 99%

Probing the population of the spin–orbit split levels in the actinide 5f states

et al. 2006

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Spin-orbit interaction in the 5f states is believed to strongly influence exotic behaviors observed in actinides metals and compounds. Understanding these interactions and how they relate to the actinide series is of considerable importance. To address this issue, the branching ratio of the white-line peaks of the N 4,5 edges for the light actinide metals, -Th, -U, and -Pu were recorded using electron energy-loss spectroscopy (EELS) in a transmission electron microscope (TEM) and synchrotron-radiation-based x-ray absorption spectroscopy (XAS). Using the spin-orbit sum rule and the branching ratios from both experimental spectra and many-electron atomic spectral calculations, accurate values of the spin-orbit interaction, and thus the relative occupation of the j = 5/2 and 7/2 levels, are determined for the actinide 5f states. Results show that the spin-orbit sum rule works very well with both EELS and XAS spectra, needing little or no correction. This is important, since the high spatial resolution of a TEM can be used to overcome the problems of single crystal growth often encountered with actinide metals, allowing acquisition of EELS spectra, and subsequent spin-orbit analysis, from nm-sized regions.The relative occupation numbers obtained by our method have been compared with recent theoretical results and show a good agreement in their trend.

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“…Rather than forming an fcc lattice, similar to aluminum, the uranium unit cell is stretched and compressed into a face-centered orthorhombic cell (see Figure 3). Additionally, because of the high degree of electron correlations, a charge density wave forms in the crystal that pushes some of the atoms off lattice sites (Lander, 1994).…”

Section: Alpha-phase Uranium Metalmentioning

confidence: 99%

“…We began our solid-state structure calculations of uranium compounds using the ABINIT code (ABINIT, 2010), and here we report results on alpha-phase uranium metal. Alpha uranium is a solid that is reasonably well understood and has a very unusual feature of lattice distortion due to a charge density wave (Lander, 1994).…”

mentioning

confidence: 99%

Nevada Test Site-Directed Research and Development, FY 2008 Annual Report

Bender¹

2009

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The solid-state properties of uranium A historical perspective and review

Cited by 170 publications

References 164 publications

Lattice Dynamics and Superconductivity in Cerium at High Pressure

Lattice Dynamics and Superconductivity in Cerium at High Pressure

Probing the population of the spin–orbit split levels in the actinide 5f states

Nevada Test Site-Directed Research and Development, FY 2008 Annual Report

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