77 citations · 118 across the 4 of their papers we have counts for
9 papers
Orbital excitations in titanates
C. Ulrich, A. Gössling, M. Grüninger +6
Raman scattering is used to observe pronounced electronic excitations around 230 meV - well above the two-phonon range - in the Mott insulators LaTiO and YTiO. Based on the…
Theory of optical spectral weights in Mott insulators with orbital degrees of freedom
Giniyat Khaliullin, Peter Horsch, Andrzej M. Oles
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…
Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model
J. Sirker, G. Khaliullin
We study a new version of the one-dimensional spin-orbital model with spins S=1 relevant to cubic vanadates. At small Hund's coupling J_H we discover dimerization in a pure electro…
Orbital effects in manganites
Jeroen van den Brink, Giniyat Khaliullin, Daniel Khomskii
We review some aspects related to orbital degrees of freedom in manganites. The Mn ions in these compounds have double orbital degeneracy and are strong Jahn-Teller ions, ca…
Density response of the t-J model and renormalization of breathing and half-breathing phonon modes: A slave-fermion calculation
P. Horsch, G. Khaliullin, V. Oudovenko
The density fluctuation spectrum is calculated for the t-J model in the low-doping regime using a slave-fermion method for the constrained fermions. The obtained res…
Density response of cuprates and renormalization of breathing phonons
P. Horsch, G. Khaliullin
We analyse the dynamical density fluctuation spectra for cuprates starting from the model in a slave-boson 1/N representation. The results obtained are consistent with diagon…