Dielectric spectroscopy on the quasi–one-dimensional organic charge density wave conductor (Fluoranthene)2PF6
Physikalisches Institut und Bayreuther Institut für Makromolekülforschung,
Universität Bayreuth - D-95440 Bayreuth, Germany
2 IBM Research Division, Zurich Research Laboratory CH-8803 Rüschlikon, Switzerland
Accepted: 5 June 1996
Frequency-dependent complex conductivity measurements on the organic quasi–one-dimensional CDW system between and at temperatures ranging from 20 K to 290 K are reported. Below the temperature of the Peierls transition () the real part of the conductivity exhibits two structures, which can be attributed to two modes of the charge density wave (CDW): a temperature-dependent low-frequency relaxational mode of local oscillating deformations and a high-frequency resonant mode of the pinned CDW as a whole. The measurements indicate that the damping of the relaxational mode is dominated by free carriers in the covered temperature range. At low temperatures the dynamics of the CDW in shows features characteristic of the transition into a glass-like state.
PACS: 71.45.Lr – Charge-density-wave systems / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, 1996