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Strongly Correlated Electrons

  • P. Fulde
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 100)

Abstract

Electron correlations are strong when the on-site electron-electron repulsions U are much larger than the energies associated with the overlap of atomic orbitals belonging to different atoms (resonance energies). The latter are characterized in a solid by the width W of the energy band under consideration. A large ratio U/W is expected in systems involving well-localized 4f or 5f electrons, i.e., rare earth or actinide atoms. Yet systems with d electrons can be strongly correlated, too. A famous example is CoO. If we treated it within the independent electron approximation we would find that this substance is metallic, with an odd number of electrons per unit cell and a partially filled d band. In reality, however, CoO is an insulator. The same holds true for La2CuO4, a prototype for a class of materials with high superconducting transition temperatures (Sect. 14.2). CoO and La2CuO4 are not metallic because the strong electron correlations suppress the charge fluctuations required for a nonvanishing conductivity. Instead they are insulators.

Keywords

Conduction Electron High Occupied Molecular Orbital Hubbard Model Magnetic Impurity Slater Determinant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • P. Fulde
    • 1
  1. 1.MPI für Physik Komplexer SystemeDresdenGermany

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