Title: Pressure-induced Americium Valence Fluctuations Revealed by Electrical Resistivity
Authors: KOLOMIETS A. V.GRIVEAU JEAN-CHRISTOPHEHEATHMAN STEPHENSHICK A. B.WASTIN FRANCKFAURE P.KLOSEK V.GENESTIER C.BACLET N.HAVELA L.
Citation: EUROPHYSICS LETTERS vol. 82 p. 57007
Publisher: EDP SCIENCES S A
Publication Year: 2008
JRC N°: JRC45826
ISSN: 0295-5075
URI: http://www.epljournal.org
http://publications.jrc.ec.europa.eu/repository/handle/JRC45826
DOI: 10.1209/0295-5075/82/57007
Type: Articles in Journals
Abstract: Electrical resistivity of americium-plutonium fcc alloys was studied over a series of high-pressure¿induced structural phase transitions accompanied by a volume collapse. The temperature dependence of resistivity flattens progressively in the high-pressure phases pointing to the presence of random strong scatterers at the Fermi energy. A theoretical analysis shows that this development is not related to the expected simple delocalization of Am 5f states. Instead it points to pressure-induced americium valence fluctuations (5f6-5f7), which provides a new microscopic basis for the understanding of transuranium materials on the verge of localization of the 5f electronic states.
JRC Institute:Institute for Transuranium Elements

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