Naslov
Collective charge excitations below the metal-to-insulator transition in BaVS3

Autori
Ivek, Tomislav ; Vuletić, Tomislav ; Tomić, Silvia ; Akrap, Ana ; Berger, H ; Forro, Laszlo

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 78 (2008), 3; 035110-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
charge density wave; orbital ordering; dielectric spectroscopy

Sažetak
The charge response in the barium vanadium sulfide (\bavs{; ; ; ; }; ; ; ; ) single crystals is characterized by dc resistivity and low frequency dielectric spectroscopy. A broad relaxation mode in MHz range with huge dielectric constant $\approx 10^6$ emerges at the metal-to-insulator phase transition $T_{; ; ; ; \mathrm{; ; ; ; MI}; ; ; ; }; ; ; ; \approx 67$~K, weakens with lowering temperature and eventually levels off below the magnetic transition $T_\chi \approx 30$~K. The mean relaxation time is thermally activated in a manner similar to the dc resistivity. These features are interpreted as signatures of the collective charge excitations characteristic for the orbital ordering that gradually develops below

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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