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Magnetic interactions and optical spectral weights in Mott insulators with orbital degrees of freedom
Author(s) -
Oleś Andrzej M.,
Horsch Peter,
Khaliullin Giniyat
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200460040
Subject(s) - multiplet , condensed matter physics , mott transition , degeneracy (biology) , physics , mott insulator , spin (aerodynamics) , strongly correlated material , anisotropy , degrees of freedom (physics and chemistry) , metal–insulator transition , quantum mechanics , spectral line , hubbard model , bioinformatics , superconductivity , thermodynamics , biology , electron , electrical resistivity and conductivity
Abstract We outline a unified approach to magnetic and optical properties of Mott insulators at orbital degeneracy, which provides deep insight into the complex spin–orbital physics. It introduces partial sum rules for individual optical excitations which follow from the multiplet structure of transition metal ions. We show that the observed anisotropies and the temperature dependence of the optical spectral weights in LaVO 3 and LaMnO 3 follow from spin and orbital correlations and are well understood within this approach. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)