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Spin-Orbit Coupling Versus Exchange Interaction in Actinide Metals

Published online by Cambridge University Press:  01 February 2011

Gerrit van der Laan and
Kevin Thomas Moore
Gerrit van der Laan
Affiliation:
g.vanderlaan@dl.ac.uk, Diamond Light Source, Synchrotron Radiation, RAL, Didcot, OX11 0DE, United Kingdom
Kevin Thomas Moore
Affiliation:
moore78@llnl.gov, Lawrence Livermore National Laboratory, Chemistry and Materials Science Directorate, Livermore, CA, 94550, United States
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Abstract

The electronic structure of the actinide metals, Th, U, Np, Pu, Am, and Cm, is investigated using electron energy-loss spectroscopy (EELS) in a transmission electron microscope, together with many-electron spectral calculations. At the N 4,5 edge, sum rule analysis gives the angular part of the spin-orbit interaction per hole, showing that while light metals (Th and U) follow LS coupling, heavier metals (Pu, Am, and Cm) follow intermediate coupling of the 5f states. The intermediate coupling is near the jj limit for Pu and Am, but strongly shifted towards the LS coupling limit for Cm. At the O 4,5 edge many-electron spectral calculations show that the prepeak corresponds to a “forbidden” transition.

Keywords

actinideelectron energy loss spectroscopy (EELS)metal

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