Orbital polaron lattice formation in lightly doped La1-xSrxMnO3

Details Orbital polaron lattice formation in lightly doped La1-xSrxMnO3 Orbital polaron lattice formation in lightly doped La1-xSrxMnO3

2005-08-02

arxiv.org/abs/cond-mat/0508064v2

Phys. Rev. Lett. 95, 236401 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.95.236401

By resonant x-ray scattering at the Mn K-edge on La7/8Sr1/8MnO3, we show that an orbital polaron lattice (OPL) develops at the metal-insulator transition of this compound. This orbital reordering explains consistently the unexpected coexistence of ferromagnetic and insulating properties at low temperatures, the quadrupling of the lattice structure parallel to the MnO2-planes, and the observed polarization and azimuthal dependencies. The OPL is a clear manifestation of strong orbital-hole interactions, which play a crucial role for the colossal magnetoresistance effect and the doped manganites in general.

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