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Strongly correlated electron systems: Photoemission and the single-impurity model

A. J. Arko, J. J. Joyce, A. B. Andrews, J. D. Thompson, J. L. Smith, D. Mandrus, M. F. Hundley, A. L. Cornelius, E. Moshopoulou, Z. Fisk, P. C. Canfield, and Alois Menovsky
Phys. Rev. B 56, R7041(R) – Published 15 September 1997
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Abstract

We present high-resolution, angle-resolved photoemission spectra for Ce-based and U-based strongly correlated electron systems. The experimental results are irreconcilable with the long-accepted single-impurity model, which predicts a narrow singlet state, in close proximity to the Fermi energy, whose linewidth and binding energy are a constant determined by a characteristic temperature TK for the material. We report that both 4f and 5f photoemission features disperse with crystal momentum at temperatures both above and below TK; these are characteristics consistent with narrow bands but not with the single-impurity model. Inclusion of the lattice must be considered at all temperatures. Variants of the periodic Anderson model are consistent with this approach.

  • Received 6 March 1997

DOI:https://doi.org/10.1103/PhysRevB.56.R7041

©1997 American Physical Society

Authors & Affiliations

A. J. Arko, J. J. Joyce, A. B. Andrews, J. D. Thompson, J. L. Smith, D. Mandrus, M. F. Hundley, and A. L. Cornelius

  • Los Alamos National Laboratories, Los Alamos, New Mexico 87545

E. Moshopoulou and Z. Fisk

  • NHMFL, Florida State University, Tallahassee, Florida 32306-4005

P. C. Canfield

  • Iowa State University/Ames Laboratory, Ames, Iowa 50011

Alois Menovsky

  • Natuurkundig Laboratorium, University of Amsterdam, Amsterdam, The Netherlands

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Vol. 56, Iss. 12 — 15 September 1997

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