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Electronic Structure of δ-Pu and PuCoGa5 from Photoemission and the Mixed Level Model

Published online by Cambridge University Press:  01 February 2011

John J. Joyce ,
John M. Wills ,
Tomasz Durakiewicz ,
Elzbieta Guziewicz ,
Martin T. Butterfield ,
Aloysius J. Arko ,
David P. Moore ,
John L. Sarrao ,
Luis A. Morales  and
Olle Eriksson
John J. Joyce
Affiliation:
Condensed Matter & Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
John M. Wills
Affiliation:
Theoretical Division, LANL
Tomasz Durakiewicz
Affiliation:
Condensed Matter & Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Elzbieta Guziewicz
Affiliation:
Condensed Matter & Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Martin T. Butterfield
Affiliation:
Condensed Matter & Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Aloysius J. Arko
Affiliation:
Condensed Matter & Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
David P. Moore
Affiliation:
Nuclear Materials Technology Division, LANL
John L. Sarrao
Affiliation:
Condensed Matter & Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Luis A. Morales
Affiliation:
Nuclear Materials Technology Division, LANL
Olle Eriksson
Affiliation:
Department of Physics, Uppsala University, Box 530, Sweden
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Abstract

The electronic structure of δ-phase Pu metal and the Pu-based superconductor PuCoGa5 is explored using photoelectron spectroscopy and a novel theoretical scheme. Excellent agreement between calculation and experiment defines a path forward for understanding electronic structure aspects of Pu-based materials. The photoemission results show two separate regions of 5f electron spectral intensity, one at the Fermi energy and another centered 1.2 eV below the Fermi level. A comparison is made between the photoemission data and five computational schemes for δ-Pu. The results for δ-Pu and PuCoGa5 indicate 5f electron behavior on the threshold between localized and itinerant and a broader framework for understanding the fundamental electronic properties of the Pu 5f levels in general within two configurations, one localized and one itinerant.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD7.3
Copyright
Copyright © Materials Research Society 2004

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