The magnetic structure of the Jahn-Teller System LaTiO3

Details The magnetic structure of the Jahn-Teller System LaTiO3 The magnetic structure of the Jahn-Teller System LaTiO3

2004-07-20

arxiv.org/abs/cond-mat/0407524v2

Phys. Rev. B 71, 144412 (2005); Phys. Rev. B 76, 059901 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

21 pages, 6 figures

Scientific paper

10.1103/PhysRevB.71.144412

We investigate the effect of the experimentally observed Jahn-Teller distortion of the oxygen octahedra in LaTiO3 on the magnetic exchange. We present a localized model for the effective hopping between nearest-neighbor Ti ions and the intra-site Coulomb interactions, based on a non-degenerate orbital ground state due to the static crystal field. The latter corresponds to an orbital order which recently has been confirmed experimentally. Using perturbation theory we calculate, in addition to the Heisenberg coupling, antisymmetric and symmetric anisotropy terms of the superexchange spin Hamiltonian which are caused by the spin-orbit interaction. Employing our superexchange Hamiltonian, we deduce the magnetic order at low temperatures which is found to be in good agreement with experiment.

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