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Charge Transport in Conducting Polymers near the Crictical and Insulating Regimes
Author(s) -
Ahlskog M.,
Me Reghu.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199801)205:1<305::aid-pssb305>3.0.co;2-b
Subject(s) - condensed matter physics , materials science , electrical resistivity and conductivity , polymer , hydrostatic pressure , power law , conductivity , thermodynamics , physics , composite material , quantum mechanics , statistics , mathematics
The metal–nsulator (M–I) transition in doped conjugated polymers is interpreted as an example of a disorder‐induced Anderson transition. The power law behaviour of the temperature dependent resistivity has been observed in several conducting polymer systems for a wide range of temperature at low temperatures. The reduced activation energy W = — T {d ln ρ/T)/dT} is nearly temperature independent, corresponding to the power law behaviour of the conductivity, in the critical regime of the M–I transition. W ( T ) has a positive (negative) temperature coefficient in the metallic (insulating) regimes. We present examples of tuning through the M–I transition: A sample in the metallic regime close to the transition boundary can be driven to the critical regime with a magnetic field or a sample on the insulating side can be made metallic by applying a hydrostatic pressure.