The Anti-Jahn-Teller Polaron in LaMnO${}_3$

Abstract

Distortions of the oxygen sublattice couple to $e_g$ orbitals of Mn${}^{3+}$ and drive a cooperative Jahn-Teller (orbital ordering) transition in LaMnO${}_3$. A simple model for this transition is studied. Without further adjustment, the model predicts the shape and stability of small (anti-Jahn-Teller) polarons which form when holes are doped into the material. This leads to a new description of the lightly doped insulator, the anti-ferromagnetic to ferromagnetic transition, and the metal-insulator transition.

8 pages, 5 figures; The revised version contains a discussion of the antiferromagnetic A to Ferromagnetic phase boundary, and an appendix giving details of the perturbative calculations

References in corpus (3)

• Optical Conductivity of Manganites: Crossover from Jahn-Teller Small Polaron to Coherent Transport in the Ferromagnetic State
• Polaron Absorption in a Perovskite Manganite La0.7Ca0.3MnO3
• Toward a Theory of Orbiton Dispersion in LaMnO_3

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