Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-10-02
Prog. Theor. Phys. Suppl. {160}, 155 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
48 pages, 5 figures; typos corrected, journal reference added
Scientific paper
10.1143/PTPS.160.155
Basic mechanisms controlling orbital order and orbital fluctuations in transition metal oxides are discussed. The lattice driven classical orbital picture, e.g. like in manganites LaMnO$_3$, is contrasted to the quantum behavior of orbitals in frustrated superexchange models as realised in pseudocubic titanites ATiO$_3$ and vanadates AVO$_3$. In YVO$_3$, the lattice and superexchange effects strongly compete -- this explains the extreme sensitivity of magnetic states to temperature and doping. Lifting the $t_{2g}$ orbital degeneracy by a relativistic spin-orbital coupling is considered on example of the layered cobaltates. We find that the spin-orbital mixing of low-energy states leads to unusual magnetic correlations in a triangular lattice of the CoO$_2$ parent compound. Finally, the magnetism of sodium-rich compounds Na$_{1-x}$CoO$_2$ is discussed in terms of a spin/orbital polaronic liquid.
No associations
LandOfFree
Orbital order and fluctuations in Mott insulators does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Orbital order and fluctuations in Mott insulators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orbital order and fluctuations in Mott insulators will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-612224