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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Related Experiment Video

Updated: May 9, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Doping induced spin state transition in LaCoO3: dynamical mean-field study.

P Augustinský1, V Křápek, J Kuneš

  • 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany.

Physical Review Letters
|July 16, 2013
PubMed
Summary

Dynamical mean-field theory reveals that the intermediate spin state is not crucial for LaCoO3

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Published on: January 19, 2018

Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Lanthanum cobaltate (LaCoO3) exhibits complex magnetic and electronic properties.
  • Understanding the electronic structure and spin states is key to explaining its behavior.

Purpose of the Study:

  • Investigate the electronic and magnetic properties of hole and electron doped LaCoO3.
  • Clarify the roles of different electron orbitals (t2g and eg) and spin states.

Main Methods:

  • Utilized dynamical mean-field theory (DMFT) for theoretical calculations.
  • Analyzed one-particle spectra and temporal spin-spin correlation functions.
  • Compared theoretical results with experimental x-ray absorption spectra.

Main Results:

  • The atomic intermediate spin state is not essential for the observed Curie-Weiss susceptibility.
  • Found narrow quasiparticle bands of t2g character at the Fermi level.
  • Observed strongly damped eg excitations, contrary to common assumptions.

Conclusions:

  • The electronic behavior of doped LaCoO3 is dominated by t2g electrons.
  • The eg electrons contribute as strongly damped excitations.
  • This work refines the understanding of spin-state transitions in perovskite cobaltates.