engleski

BaVS3:Dielectric spectroscopy study

The charge response in the barium vanadium sulfide (BaVS3) single crystals is characterized by dc resistivity and low frequency dielectric spectroscopy. A broad relaxation mode centred at kHz-MHz frequencies with huge dielectric constant 10^6 emerges at the metal-to-insulator phase transition TMI=67 K, weakens with lowering temperature and eventually levels off below the magnetic transition T=30 K. The mean relaxation time is thermally activated in a manner similar to the dc conductivity. These features might be interpreted as signatures of the collective charge excitations characteristic for the orbital ordering that gradually develops below TMI and stabilizes at long range scale below 30K.

Dielectric spectroscopy; strongly correlated system; charge-density wave; orbital ordering

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