Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00158 : Measurements of charge localization effects in uranium and plutonium intermetallic compounds from $L_{\rm III}$ X-ray absorption spectroscopy
Author:
At the heart of the complex behavior of 5$f$-electrons in uranium
and plutonium is the variable localization of the 5$f$ orbital.
Plutonium, in particular, can behave like
a localized lanthanide system or a delocalized transition-metal
system,
depending on its coordination environment. This behavior gives
rise to a variety of novel physical
properties in U and Pu compounds: unexpected magnetic
susceptibilities,
non-Fermi-liquid behavior, superconductivity, etc. To understand
the dual
nature of U and Pu 5$f$ orbitals, we report measurements of the
actinide
$L_{\rm III}$-edge X-ray absorption spectra, including
high-resolution partial fluorescence yield measurements,
for a wide variety of intermetallics, including $\alpha$-U,
UCoGa$_5$, UCd$_{11}$, $\alpha-$ and
$\delta-$Pu, PuCoGa$_5$, and PuCoIn$_5$. A systematic shift of
the $L_{\rm III}$-edge
energy is observed, and is correlated to the Sommerfeld
coefficient from heat capacity measurements.
Based on these results, we argue that this type of
experiment is a direct measure of the degree of 5$f$ orbital
localization for U and
Pu.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.158
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