Optical conductivity in doped manganites with planar x$^2$-y$^2$ orbital order

Details Optical conductivity in doped manganites with planar x$^2$-y$^2$ orbital order Optical conductivity in doped manganites with planar x$^2$-y$^2$ orbital order

1999-03-15

arxiv.org/abs/cond-mat/9903226v1

Phys. Rev. Lett. 82, 3160 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.3160

We investigate a planar model for the ferromagnetic (FM) phase of manganites, which develops orbital order of $e_g$ electrons with x$^2$-y$^2$-symmetry at low temperature. The dynamic structure factor of orbital excitations and the optical conductivity $\sigma(\omega)$ are studied with help of a finite-temperature diagonalization method. Our calculations provide a theoretical prediction for $\sigma(\omega)$ for the 2D FM state and are of possible relevance for the recently found A-type phase of manganites at high doping which consists of FM layers coupled antiferromagnetically. In the x$^2$-y$^2$ ordered regime $\sigma(\omega)$ shows both a Drude peak and a gapped incoherent absorption due to a gap in the orbital excitations.

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