Hole dynamics in spin and orbital ordered vanadium perovskites

Details Hole dynamics in spin and orbital ordered vanadium perovskites Hole dynamics in spin and orbital ordered vanadium perovskites

2004-08-18

arxiv.org/abs/cond-mat/0408395v1

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, 4figures

Scientific paper

10.1103/PhysRevLett.94.156408

Hole dynamics in spin and orbital ordered vanadates with perovskite structure is investigated. A mobile hole coupled to the spin excitation (magnon) in the spin G-type and orbital C-type (SG/OC) ordered phase, and that to the orbital excitation (orbiton) in the spin C-type and orbital G-type (SC/OG) one are formulated on an equal footing. The observed fragile character of the (SG/OC) order is attributed to the orbiton softening caused by a reduction of the taggered magnetic order parameter. It is proposed that the qualitatively different hole dynamics in the two spin-orbital ordered phases in vanadates can be probed by the optical spectra.

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