Title: Spectral Line Shapes of U M2- and As K-edge Resonant X-ray Scattering in the Two Antiferromagnetic Phases of UAs
Authors: NORMILE PeterWILKINS S.b.DETLEFS B.MANNIX D.BLACKBURN ElizabethBOUCHENOIRE L.BERNHOEFT N.LANDER Gerard
Citation: PHYSICAL REVIEW B-CONDENSED MATTER vol. 75 p. 184437-1 184437-10
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2007
JRC Publication N°: JRC37988
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC37988
Type: Articles in Journals
Abstract: We present resonant x-ray scattering measurements on uranium arsenide at the U M2 and As K absorption edges. The studies at both edges relate to aspects of the hybridization involving the 5f states in UAs. At the U M2 edge, the spectral line shapes are found to differ between the two antiferromagnetic phases of UAs. In the type-I phase, the line shapes may be fitted using a single resonant component, whereas in the type-IA phase, a second resonant component, 3.5 eV above the first component, is required to fit the line shapes in the rotated polarization scattering channel. The possibility that the single first component in the type-I type-IA phase corresponds to E2 scattering due to the ordered 5f magnetic-dipole moments and that in the type-IA phase the second component represents an E1 process involving polarized 6d U states is considered. Similar line shapes are observed for the two antiferromagnetic phases at the As K edge, a result which is in discordance with a recent theoretical prediction. The experimentally observed As K-edge line shape has an asymmetrical form in both phases, which possibly relates to As 4p-band effects unaccounted for in the theory.
JRC Institute:Institute for Transuranium Elements

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.