Cooperative Jahn-Teller Effect on the Magnetic Structure of Manganese Oxides

Abstract

The magnetic structure of LaMnO${}_3$ is investigated on three-dimensional clusters of MnO${}_6$ octahedra by using a combination of relaxation and Monte Carlo techniques. It is found that the cooperative Jahn-Teller phonons lead to the stabilization of A-type antiferromagnetic and C-type orbital structures in the physically relevant region of parameter space for LaMnO${}_3$ with small corrections due to tilting effects. The results suggest that strong Coulomb interactions are not necessary for a qualitative description of undoped manganites. In fact, it is shown that the present result is not essentially changed even if the Coulomb interaction is explicitly included.

15 pages, Latex, with 9 figures embedded in the text. To appear in proceedings of the conference "Science and Technology of Magnetic Oxides '99", La Jolla, July 5--7, 1999