Origin of the Optical Gap in Half-Doped Manganites

Details Origin of the Optical Gap in Half-Doped Manganites Origin of the Optical Gap in Half-Doped Manganites

2002-09-03

arxiv.org/abs/cond-mat/0209052v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 7 figures, 1 table to appear on Physical Review B

Scientific paper

10.1103/PhysRevB.66.094427

We have analyzed the coexisting charge and orbital ordering in half-doped manganites using a model which includes Coulomb and Jahn-Teller orbital polarization interactions. Most surprisingly, the gap in the optical conductivity is reduced by both on-site and intersite Coulomb interactions, but increases and explains the experimental results when the Jahn-Teller terms with orbital polarization are considered. The origin of this behavior is explained within a molecular model which arises in the limit of extreme topological frustration, when single electrons are confined to molecular units consisting of three orbitals.

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