Pressure-induced Americium Valence Fluctuations Revealed by Electrical Resistivity
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.
KOLOMIETS A. V.;
GRIVEAU Jean-Christophe;
HEATHMAN Stephen;
SHICK A. B.;
WASTIN Franck;
FAURE P.;
KLOSEK V.;
GENESTIER C.;
BACLET N.;
HAVELA L.;
2008-06-03
EDP SCIENCES S A
JRC45826
0295-5075,
www.epljournal.org,
https://publications.jrc.ec.europa.eu/repository/handle/JRC45826,
10.1209/0295-5075/82/57007,
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