Electrically detected magnetic resonance applied to polyaniline

The transport properties of polyaniline films have been investigated by electrically detected magnetic resonance (EDMR) in different protonation states. In polyaniline, a spin-dependent interchain tunneling involving a polaron-polaron transition is found. The EDMR signal in polyaniline is found to be dependent on the DC electric field, protonation level as well as the atmosphere. For low electric fields, and samples with parallel contacts (F < 1000 V/cm) one resonance line is observed, for higher fields, two resonance lines are observed, having similar g-factors but different linewidths. For samples with sandwich only one broad resonance is observed.