Orbital Rotations induced by Charges of Polarons and Defects in Doped Vanadates
Peter Horsch,
Andrzej M. Oleś,
Adolfo Avella
Abstract:We explore the competiton of doped holes and defects that leads to the loss of orbital order in vanadate perovskites. In compounds such as La1−xCa xVO3 spin and orbital order result from super-exchange interactions described by an extended three-orbital degenerate Hubbard-Hund model for the vanadium t2g electrons. Longrange Coulomb potentials of charged Ca 2+ defects and e-e interactions control the emergence of defect states inside the Mott gap. The quadrupolar components of the Coulomb fields of doped holes … Show more
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