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Electronic Structure of PuCoGa5 and UCoGa5

Published online by Cambridge University Press:  26 February 2011

Eric Bauer
Affiliation:
edbauer@lanl.gov, Los Alamos National Laboratory, Los Alamos National Lab, PO Box 1663, MS K764, Los Alamos, NM, 87545, United States
T. Durakiewicz
Affiliation:
edbauer@lanl.gov, LANL
M. T. Butterfield
Affiliation:
edbauer@lanl.gov, LANL
E. Guziewicz
Affiliation:
edbauer@lanl.gov, Polish Academy of Sciences
J. J. Joyce
Affiliation:
edbuaer@lanl.gov, LANL
C. G. Olson
Affiliation:
edbauer@lanl.gov, Iowa State University, Ames Lab
L. A. Morales
Affiliation:
edbauer@lanl.gov, LANL
J. L. Sarrao
Affiliation:
edbauer@lanl.gov, LANL
J. D. Thompson
Affiliation:
edbauer@lanl.gov, LANL
Corresponding
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Abstract

The electronic structure of the Pu-based superconductor PuCoGa5 and the Pauli paramagnet UCoGa5 is investigated using photoemission spectroscopy. The photoemission data of PuCoGa5 reveal features at the Fermi energy EF and about 1-1.5 eV below EF indicative of itinerant and localized f-electrons, respectively. Angle-resolved spectra of UCoGa5 show two peaks at similar energies that are highly dispersive, providing evidence for itinerant character of the f-electrons in this material. A comparison of the PuCoGa5 and UCoGa5 data to the spectra of α-Pu and δ-Pu serves to place PuCoGa5 within the context of the more general electronic structure problem in elemental Pu.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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