The dynamics of orbital-ordering domain wall in orbital ordered systems

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We have studied the domain wall (DW) dynamics of orbital order for the correlated electron systems. Specifically, we investigated the broad-band dielectric spectra for the layered Mn-oxides with K2NiF4 structure and perovskite-type vanadates and identified the novel excitation associated with the motion of domain wall. For perovskite vanadates, the anisotropic dielectric dispersion is observed despite of the nearly isotropic crystal structure, indicating that the DW dynamics reflects the 1D-nature of the orbital exchange interaction coupled to the magnetic ordering.