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TT: Tiefe Temperaturen
TT 6: Correlated Electrons - (General) Theory I
TT 6.1: Talk
Friday, March 4, 2005, 14:00–14:15, TU H2053
Theory of optical spectral weights in Mott insulators with orbital degeneracy — •Peter Horsch1, Giniyat Khaliullin1, and Andrzej M. Oles1,2 — 1Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany — 2Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Krakau, Poland
Introducing partial sum rules for the optical multiplet transitions, we outline a unified approach to magnetic and optical properties of strongly correlated transition metal oxides. On the examples of LaVO3 and LaMnO4 we demonstrate how the temperature and polarization dependences of different components of the optical multiplet are determined by the underlying spin and orbital correlations dictated by the low-energy superexchange Hamiltonian.
G. Khaliullin, P. Horsch, and A.M. Oleś, Phys. Rev. B 70, 195103 (2004).