Peierls Instability and Charge-Density-Wave Transport in Fluoranthene and Perylene Radical Cation Salts

• Authors: W. Brütting , W. Riess
• Languages of publication: EN

Abstracts

EN

Fluoranthene and perylene radical cation salts are quasi-one-dimensional conductors, which show a Peierls transition to a charge-density-wave ground state. Radical cation salts with different stoichiometries composed of the aromatic donor molecules fluoranthene (Fa = C_{16}H_{10}) or perylene (Per = C_{20}H_{12}) and the counterion X¯ = PF¯_{6} were investigated. We find that the temperature dependence of the electrical conductivity and the properties in the charge-density-wave ground state strongly depend on the composition of the crystals. When fluoranthene is replaced by perylene, the Peierls transi­tion is shifted from 180 K to 120 K and the ground state energy gap decreases from values of 120-180 meV to 60-80 meV. In the charge-density-wave ground state the threshold field for nonlinear conductivity varies between 0.1 and 1 V/cm for different systems. Our results indicate that disorder, three-dimensional coupling and commensurability effects play an important role for the transport properties of these systems.

Keywords

EN

71.45.Lr; 71.30.+h; 72.10.Bg; 72.80.Le

Discipline

• 72.10.Bg: General formulation of transport theory
• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 71.45.Lr: Charge-density-wave systems(see also 75.30.Fv Spin-density waves)
• 72.80.Le: Polymers; organic compounds (including organic semiconductors)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 4-5
• Pages: 785-790

Dates

published

1995-04

Contributors

author

W. Brütting

• Physikalisches Institut and Bayreuther Institut für Makromolekülforschung (BIMF), Universität Bayreuth, D-95440 Bayreuth, Germany

author

W. Riess

• Physikalisches Institut and Bayreuther Institut für Makromolekülforschung (BIMF), Universität Bayreuth, D-95440 Bayreuth, Germany

Identifiers

DOI

10.12693/APhysPolA.87.785