Changes in the electronic structure of cerium due to variations in close packing

Moore, K. T.; Chung, B W; Morton, Simon A.; Schwartz, Adam J.; Tobin, J. G.; Lazar, Sorin; Tichelaar, F.D.; Zandbergen, H.W.; Söderlind, Per; Laan, G. van der

doi:10.1103/physrevb.69.193104

Cited by 38 publications

(23 citation statements)

References 28 publications

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“…In the k = 1 spectrum of the N 4,5 spectra the broadening was optimized for the pre-edge structure in the EELS spectra. A good agreement for the giant resonance region can be obtained by convolving the main peaks with a Fano line shape of half-width of 4-6 eV and an asymmetry parameter of 4-2.5 [34].…”

Section: Theorymentioning

confidence: 98%

“…1. Ce EELS measurements have been reported previously [34] and are included here for completeness and to highlight the agreement with the low-q NIXS measurement. Since the chemical purity of the Ce was verified in-situ using x-ray fluorescence during the EELS measurements, the NIXS-EELS agreement validates that the NIXS measurements probed metallic Ce.…”

Section: A the N 45 Spectramentioning

confidence: 99%

“…For NIXS measurements, samples were exposed to air for less than 30 seconds, and for EELS measurements air exposure was a few minutes. This amount of exposure to air is known to produce at most 1-2 nm of oxide on each side of the TEM sample surface, since the ion-milling passivates the metal surface, inhibiting reactivity [34,35]. Furthermore, all EELS samples were evaluated in situ by comparing the lanthanide fluorescence intensity to the oxygen K-α fluorescence intensity and were deemed to be highly pure metals.…”

Section: Methodsmentioning

confidence: 99%

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Core and shallow-cored- tof-shell excitations in rare-earth metals

et al. 2011

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We report on the results of probing the light lanthanide metals Ce, Pr, and Nd with inelastic x-ray and electron scattering. Transmission electron microscope-based electron spectroscopy and nonresonant inelastic x-ray scattering are shown to be in a high degree of accord, and here serve as complementary probes of electronic structure. The high resolution and high signal-to-noise electron technique allows for the measurement of the complex and subtle excitation spectra in the lanthanide metals, validating the applicability of the screened trivalent atomic model used for these materials. In addition, the momentum transfer dependence of the x-ray scattering is extracted and compared against atomic calculations for the most tightly bound excitonic resonances, which provides a direct test of the predicted atomic radial wave functions.

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Section: Theorymentioning

confidence: 98%

Section: A the N 45 Spectramentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Core and shallow-cored- tof-shell excitations in rare-earth metals

et al. 2011

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“…Similar intensity shifts to higher energies has been observed in XAS as well. [19] In fact, as part of a previous collaboration [20], we have observed this shift before, utilizing XAS on Beamline 8 at the Advanced Light Source. [21] Using oxidized bulk Ce samples, it was possible to see strong,…”

Section: Observation Of Strong Resonant Behavior In the Inverse Photomentioning

confidence: 99%

“…Isochromat Spectroscopy or BIS [6], Photoelectron Spectroscopy [ 6,[14][15][16][17][18], Xray Absorption Spectroscopy [19,20,21], Electron Energy Loss Spectroscopy [6,20,22,23] and Resonant XES [24,25], to name just a few. We will compare our results to those of other spectroscopies, as will be discussed below.…”

Section: Tobinmentioning

confidence: 99%

Observation of strong resonant behavior in the inverse photoelectron spectroscopy of Ce oxide

Tobin

Chung

et al. 2011

Phys. Rev. B

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Magnetic Structure of Actinide Metals

Laan¹,

Moore²

2010

Springer Proceedings in Physics

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In comparison to 3d or 4 f metals, magnetism in actinides remains poorly understood due to experimental complications and the exotic behavior of the 5 f states. In particular, plutonium metal is most especially vexing. Over the last five decades theories proposed the presence of either ordered or disordered local moments at low temperatures. However, experiments such as magnetic susceptibility, electrical resistivity, nuclear magnetic resonance, specific heat, and elastic and inelastic neutron scattering show no evidence for ordered or disordered magnetic moments in any of the six phases of plutonium. Beyond plutonium, the magnetic structure of other actinides is an active area of research given that temperature, pressure, and chemistry can quickly alter the magnetic structure of the 5 f states. For instance, curium metal has an exceedingly large spin polarization that results in a total moment of ∼8 µ B /atom, which influences the phase stability of the metal. Insight in the actinide ground state can be obtained from core-level x-ray absorption spectroscopy (XAS) and electron energy-loss spectroscopy (EELS). A sum rule relates the branching ratio of the core-level spectra measured by XAS or EELS to the expectation value of the angular part of the spin-orbit interaction.

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Changes in the electronic structure of cerium due to variations in close packing

Cited by 38 publications

References 28 publications

Core and shallow-cored- tof-shell excitations in rare-earth metals

Core and shallow-cored- tof-shell excitations in rare-earth metals

Observation of strong resonant behavior in the inverse photoelectron spectroscopy of Ce oxide

Magnetic Structure of Actinide Metals

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