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

Details The Anti-Jahn-Teller Polaron in LaMnO$_3$ The Anti-Jahn-Teller Polaron in LaMnO$_3$

1998-11-17

arxiv.org/abs/cond-mat/9811250v3

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 5 figures; The revised version contains a discussion of the antiferromagnetic A to Ferromagnetic phase boundary, and

Scientific paper

10.1103/PhysRevB.60.10747

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.

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