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Journal Article

Quantum Behavior of Orbitals in Ferromagnetic Titanates: Novel Orderings and Excitations

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Khaliullin,  G.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Khaliullin, G., & Okamoto, S. (2002). Quantum Behavior of Orbitals in Ferromagnetic Titanates: Novel Orderings and Excitations. Physical Review Letters, 89(16): 167201.


Cite as: https://hdl.handle.net/21.11116/0000-000E-E449-F
Abstract
We investigate the collective behavior of orbital angular
momentum in the spin ferromagnetic state of a Mott insulator
with t(2g) orbital degeneracy. The frustrated nature of the
interactions leads to an infinite degeneracy of classical
states. Quantum effects select four distinct orbital orderings.
Two of them have a quadrupolar order, while the other states
show in addition weak orbital magnetism. Specific predictions
are made for neutron scattering experiments which might help to
identify the orbital order in YTiO3 and to detect the
elementary orbital excitations.