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The charge response in the barium vanadium sulfide (BaVS3) single crystals ischaracterized by dc resistivity and low frequency dielectric spectroscopy. Abroad relaxation mode in MHz range with huge dielectric constant ~= 10^6emerges at the metal-to-insulator phase transition TMI ~= 67 K, weakens withlowering temperature and eventually levels off below the magnetic transitionTchi ~= 30 K. The mean relaxation time is thermally activated in a mannersimilar to the dc resistivity. These features are interpreted as signatures ofthe collective charge excitations characteristic for the orbital ordering thatgradually develops below TMI and stabilizes at long-range scale below Tchi.

Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS3