Electrically detected magnetic resonance applied to polyaniline

The transport properties of polyaniline films have been investigated by ele ctrically detected magnetic resonance (EDMR) in different protonation state s. In polyaniline, a spin-dependent interchain tunneling involving a polaro n-polaron transition is found. The EDMR signal in polyaniline is found to b e dependent on the DC electric field, protonation level as well as the atmo sphere. For low electric fields, and samples with parallel contacts (F < 10 00 V/cm) one resonance line is observed, for higher fields, two resonance l ines are observed having similar g-factors but different linewidths. For sa mples with sandwich only one broad resonance is observed.