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Abstract

High-purity ultra thin layers of Pu deposited on Mg were studied by X-ray photoelectron (XPS) and high-resolution valence band (UPS) spectroscopy. The itinerant character of the 5f states is gradually lost with reduced thickness, and the localized 5f states, which appear as a broad peak 1.6eV below the Fermi level, were observed for one monolayer. At intermediate thickness three narrow peaks appear close to the Fermi level, which are identical to features observed in PuSe and other Pu materials. A comparative study of bulk alpha-Pu indicates a surface re-organization yielding more localized f-electrons at conditions of thermodynamic equilibrium.

Additional information

Authors: GOUDER T, JRC, Institute for Transuranium Elements, Karlsruhe (DE);WASTIN L, JRC, Institute for Transuranium Elements, Karlsruhe (DE);REBIZANT J, JRC, Institute for Transuranium Elements, Karlsruhe (DE);HAVELA L, JRC, Institute for Transuranium Elements, Karlsruhe (DE) and Charles University, Department of Electronic Structures, Prague (CZ)
Bibliographic Reference: An article published in: Europhysics Letters, Vol.55, No.5 (2001), pp.705-711
Record Number: 200114198 / Last updated on: 2002-01-02
Category: PUBLICATION
Original language: en
Available languages: en