期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 26, 页码 10205-10209出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1200725109
关键词
local moment magnetism; intermediate valence; strongly correlated systems
资金
- Office of Science, Office of Basic Energy Sciences (OBES), of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
- LANL Directed Research and Development program
- U.S. DOE, OBES, Division of Materials Sciences and Engineering
Uranium and plutonium's 5f electrons are tenuously poised between strongly bonding with ligand spd-states and residing close to the nucleus. The unusual properties of these elements and their compounds (e. g., the six different allotropes of elemental plutonium) are widely believed to depend on the related attributes of f-orbital occupancy and delocalization for which a quantitative measure is lacking. By employing resonant X-ray emission spectroscopy (RXES) and X-ray absorption near-edge structure (XANES) spectroscopy and making comparisons to specific heat measurements, we demonstrate the presence of multiconfigurational f-orbital states in the actinide elements U and Pu and in a wide range of uranium and plutonium intermetallic compounds. These results provide a robust experimental basis for a new framework toward understanding the strongly-correlated behavior of actinide materials.
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