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Electronic correlations in manganites

Held1, Vollhardt

  • 1Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universitat Augsburg, 86135 Augsburg, Germany.

Physical Review Letters
|September 16, 2000
PubMed
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Local electronic correlations significantly impact colossal magnetoresistive manganites. Adding Coulomb repulsion to a Kondo lattice model reveals drastic effects on material properties, explaining experimental findings.

Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Collosal magnetoresistive manganites exhibit complex properties.
  • Existing models often lack crucial local electronic correlation effects.

Purpose of the Study:

  • Investigate the influence of local electronic correlations.
  • Explain experimental observations in manganites.

Main Methods:

  • Utilized a ferromagnetic two-band Kondo lattice model.
  • Incorporated local Coulomb repulsion.
  • Employed dynamical mean-field theory (DMFT).

Main Results:

  • Analyzed spectral functions and optical conductivity.
  • Examined the paramagnetic-to-ferromagnetic phase transition.

Related Experiment Videos

  • Observed drastic effects of electronic correlations.

    • Conclusions:

    • Local electronic correlations are critical for manganite properties.
    • The model provides insights into experimental phenomena.
    • DMFT is effective for studying correlated electron systems.