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

  • Ivek, T.
  • Vuletic, T.
  • Tomic, S.
  • Akrap, A.
  • Berger, H.
  • Forro, L.
Publication Date
Jan 01, 2008
Infoscience @ EPFL
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The charge response in barium vanadium sulfide (BaVS3) single crystals is characterized by dc resistivity and low-frequency dielectric spectroscopy. A broad relaxation mode in the megahertz range with a huge dielectric constant of approximate to 10(6) emerges at the metal-to-insulator phase transition T-MI approximate to 67 K, weakens with lowering temperature, and eventually levels off below the magnetic transition T-chi approximate to 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 T-MI and stabilizes at long-range scale below T-chi.

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