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Strongly Correlated Electrons

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Electron Correlations in Molecules and Solids

Part of the book series: Springer Series in Solid-State Sciences ((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.

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  1. MPI für Physik Komplexer Systeme, Nöthnitzer Str. 38, 01187, Dresden, Germany

    Professor P. Fulde

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  1. Professor P. Fulde
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© 1995 Springer-Verlag Berlin Heidelberg

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Fulde, P. (1995). Strongly Correlated Electrons. In: Electron Correlations in Molecules and Solids. Springer Series in Solid-State Sciences, vol 100. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-57809-0_12

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  • DOI: https://doi.org/10.1007/978-3-642-57809-0_12

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-59364-5

  • Online ISBN: 978-3-642-57809-0

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