Title: The valence-fluctuating ground state of plutonium
Authors: JANOSCHEK M.DAS PinakiCHAKRABARTI BismayanABERNATHY Douglas L.LUMSDEN Mark D.LAWRENCE J.THOMPSON J.d.LANDER G.hMITCHELL J. N.RICHMOND ScottRAMOS MikeTROUW FransZHU Jian-XinHAULE KristjanKOTLIAR G.BAUER E.d.
Publisher: American Association for the Advancement of Science (Science/AAAS)
Publication Year: 2015
JRC N°: JRC96892
ISSN: 2375-2548
URI: http://advances.sciencemag.org/content/advances/1/6/e1500188.full.pdf
http://advances.sciencemag.org/content/1/6/e1500188
http://publications.jrc.ec.europa.eu/repository/handle/JRC96892
DOI: 10.1126/sciadv.1500188
Type: Articles in periodicals and books
Abstract: A central issue in material science is to obtain understanding of the electronic correlations that control complex materials. Such electronic correlations frequently arise because of the competition of localized and itinerant electronic degrees of freedom. Although the respective limits of well-localized or entirely itinerant ground states are well understood, the intermediate regime that controls the functional properties of complex materials continues to challenge theoretical understanding. We have used neutron spectroscopy to investigate plutonium, which is a prototypical material at the brink between bonding and nonbonding configurations. Our study reveals that the ground state of plutonium is governed by valence fluctuations, that is, a quantum mechanical superposition of localized and itinerant electronic configurations as recently predicted by dynamical mean field theory. Our results not only resolve the long-standing controversy between experiment and theory on plutonium’s magnetism but also suggest an improved understanding of the effects of such electronic dichotomy in complex materials.
JRC Directorate:Nuclear Safety and Security

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