Orbital ordering in undoped manganites via a generalized Peierls instability

Details Orbital ordering in undoped manganites via a generalized Peierls instability Orbital ordering in undoped manganites via a generalized Peierls instability

2008-08-08

arxiv.org/abs/0808.1174v3

Physics

Condensed Matter

Strongly Correlated Electrons

A few changes made. Accepted in Phys. Rev. B

Scientific paper

We study the ground state orbital ordering of $LaMnO_3$, at weak electron-phonon coupling, when the spin state is A-type antiferromagnet. We determine the orbital ordering by extending to our Jahn-Teller system a recently developed Peierls instability framework for the Holstein model [1]. By using two-dimensional dynamic response functions corresponding to a mixed Jahn-Teller mode, we establish that the $Q_2$ mode determines the orbital order.

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