Possible interpretation of the photoelectron spectrum for americium metal

Mrtensson, N.; Johansson, Börje; Naegele, J. R.

doi:10.1103/physrevb.35.1437

Cited by 22 publications

(10 citation statements)

References 29 publications

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“…Our calculated one-electron density of states shown on the right consists of several distinct features related to f 6 →f 5 electron removal and f 6 →f 7 electron addition processes. One can see that occupied part of the spectrum is well compared with the available photoemission experiments [17], thus advancing previous bulk-surface interpretation [18] as well as density functional based calculations [19,20]. The idea of our new method is to model three major satellites related to 7 F 0 → 6 H 5/2 , 7 F 0 → 8 S 7/2 and 7 F 0 → 6 P 7/2 transitions with two pole self-energy and resolve them as many-body energy bands.…”

Section: Pacs Numberssupporting

confidence: 75%

Many-Body Electronic Structure of Americium Metal

2006

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We report computer based simulations of energetics, spectroscopy, and electron-phonon interaction of americium using a novel spectral density functional method. This approach gives rise to a new concept of a many-body electronic structure and reveals the unexpected mixed valence regime of Am 5f6 electrons which under pressure acquire the 5f7 valence state. This explains the unique properties of Am and addresses the fundamental issue of how the localization delocalization edge is approached from the localized side in a closed shell system.

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Section: Pacs Numberssupporting

confidence: 75%

Many-Body Electronic Structure of Americium Metal

2006

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“…And indeed the spectrum of Am metal is well described by the calculated f 6 and f 5 final state multiplet, identical to atomic (f 7 ->f 6 ) and (f 6 ->f 5 ) multiplet transitions [22]. Its non-magnetic character points to a f 6 ground-state configuration, where spin and orbital moment cancel (J=0).…”

Section: Pusimentioning

confidence: 58%

Comparative Photoemission Study of Actinide (Am, Pu, Np and U) Metals, Nitrides, and Hydrides

Thomas¹,

Seibert²,

Huber³

et al. 2006

MRS Proc.

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Core-level and valence-band spectra of Pu and the other early actinide compounds show remarkable systematics, which can be understood in the framework of final state screening. We compare the early actinide (U, Np, Pu and Am) metals, nitrides and hydrides and a few other specific compounds (PuSe, PuS, PuC x , PuSi x ) prepared as thin films by sputter deposition. In choosing these systems, we combine inherent 5f band narrowing, due to 5f orbital contraction throughout the actinide series, with variations of the chemical environment in the compounds. Goal of this work was to learn more on the electronic structure of the early actinide systems and to achieve the correct interpretation of their photoemission spectra. The highly correlated nature of the 5f states in systems, which are on the verge to localization, makes this a challenging task, because of the peculiar interplay between ground state DOS and final-state effects. Their influence can be estimated by doing systematic studies on systems with different (5f) bandwidths. We conclude on the basis of such systematic experiments that final-state effects due to strong e-e correlations in narrow 5f-band systems lead to multiplet like structures, analogous to those observed in the case of systems with localized electron states. Such observations in essentially band-like 5f-systems was first surprising, but the astonishing similarity of photoemission spectra of very different chemical systems (e.g. PuSe, Pu 2 C 3 and δ-Pu) points to a common origin, relating them to atomic features rather than material dependent density of states (DOS) features.Mater. Res. Soc. Symp. Proc. Vol. 986

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“…This structure could arguably be due to surface effects from the surface sensitivity of UPS; however, it is probable that the spectrum contains both surface and bulk contributions. The small peak at 1.8 eV has been interpreted by Johansson (1984) and Mårtenson et al (1987) as being due to a divalent (spd 2 ) surface layer, similar to observations made in Sm (Lang and Baer, 1979;Allen et al, 1980). Studies of AmN, AmSb, and Am 2 O 3 in relation to Am metal conclude that the peak at 1.8 eV is attributed to a well-screened channel of photoemission from the 5f 6 ground state, while the large peak at 2-3 eV is due to the poorly-screened channel (Gouder et al, 2005).…”

Section: F Americiummentioning

confidence: 95%

Nature of the5fstates in actinide metals

2009

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Actinide elements produce a plethora of interesting physical behaviors due to the 5f states. This review compiles and analyzes progress in understanding of the electronic and magnetic structure of the 5f states in actinide metals. Particular interest is given to electron energy-loss spectroscopy and many-electron atomic spectral calculations, since there is now an appreciable library of core d → valence f transitions for Th, U, Np, Pu, Am, and Cm. These results are interwoven and discussed against published experimental data, such as x-ray photoemission and absorption spectroscopy, transport measurements, and electron, x-ray, and neutron diffraction, as well as theoretical results, such as density-functional theory and dynamical mean-field theory.

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Possible interpretation of the photoelectron spectrum for americium metal

Cited by 22 publications

References 29 publications

Many-Body Electronic Structure of Americium Metal

Many-Body Electronic Structure of Americium Metal

Comparative Photoemission Study of Actinide (Am, Pu, Np and U) Metals, Nitrides, and Hydrides

Nature of the5fstates in actinide metals

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